Amazon Web Services Updated AIF-C01 Exam Questions and Answers by fred

The correct answer is D because Amazon Bedrock provides access to foundation models (FMs) from various providers for generative AI use cases, including text generation. It supports generating content in a consistent tone, voice, or writing style using prompts or few-shot examples.

From AWS documentation:

" Amazon Bedrock allows you to build and scale generative AI applications using foundation models from AI21 Labs, Anthropic, Cohere, Meta, Mistral, Stability AI, and Amazon. These models can generate text with controlled tone and style for applications like branding, content creation, and copywriting. "

Explanation of other options:

A. Amazon Comprehend is for natural language understanding, such as sentiment analysis and entity recognition, not generation.

B. Amazon Personalize is for building recommendation systems, not content generation.

C. Amazon Rekognition is for image and video analysis, not text generation.

Referenced AWS AI/ML Documents and Study Guides:

Amazon Bedrock Developer Guide – Generative AI Use Cases

AWS Certified Machine Learning Specialty Guide – Content Generation with FMs

The verified answer is C. F1 score. This is a classification problem: the model classifies transactions as fraudulent or non-fraudulent. AWS machine learning documentation identifies accuracy, precision, recall, and F1 score as classification evaluation metrics. F1 score is especially appropriate when the evaluation must consider both correct positive predictions and the cost of incorrect positive predictions. AWS defines F1 as the harmonic mean of precision and recall, which means it balances how many positive predictions are correct with how many actual positive cases are found.

The key issue in the question is minimizing false positives. In fraud detection, a false positive means a legitimate transaction is incorrectly classified as fraudulent. AWS documentation explains that precision evaluates how well the model avoids false positives by measuring the percentage of positive predictions that were actually correct. Because F1 includes precision, it penalizes models that generate too many false positives while also considering recall.

Accuracy is not the best answer because it only measures the overall fraction of correct predictions. In fraud detection, the dataset is often imbalanced, so a model can appear accurate while still performing poorly on fraud-related predictions. R-squared and RMSE are regression metrics, not classification metrics. R-squared measures how well a regression model explains variance, and RMSE measures prediction error magnitude for continuous numeric outputs.

Because the company needs a classification metric that reflects correct predictions and penalizes false-positive behavior, F1 score is the strongest option among the choices.

Amazon SageMaker ' s DeepAR is a supervised learning algorithm designed for forecasting scalar (one-dimensional) time series data. Time series data consists of sequences of data points indexed in time order, typically with consistent intervals between them. In the context of a retail store aiming to predict product demand, relevant time series data might include historical sales figures, inventory levels, or related metrics recorded over regular time intervals (e.g., daily or weekly). By training the DeepAR model on this historical time series data, the store can generate forecasts for future product demand. This capability is particularly useful for inventory management, staffing, and supply chain optimization. Other data types, such as text, image, or binary data, are not suitable for time series forecasting tasks and would not be appropriate inputs for the DeepAR algorithm.

The correct answer is C because Amazon Bedrock Guardrails provides out-of-the-box configurable safety mechanisms to control the behavior of LLMs in generative AI applications. Guardrails can be configured with denylists, content filters, sensitive topics, and tone enforcement, all without retraining the model.

From AWS documentation:

" Amazon Bedrock Guardrails allows developers to define safety and responsible AI policies directly in the model inference layer, making it easy to prevent harmful, biased, or unsafe outputs with minimal configuration. "

Explanation of other options:

A. Bedrock playgrounds are interactive environments for testing prompts and models but do not provide production-grade safety enforcement.

B. SageMaker Clarify focuses on bias detection and explainability for supervised ML models — it does not directly apply guardrails to LLM outputs.

D. SageMaker JumpStart is for model fine-tuning and deployment, not for enforcing safety policies on LLM responses.

Referenced AWS AI/ML Documents and Study Guides:

Amazon Bedrock Documentation – Guardrails Overview

AWS Responsible AI Whitepaper

AWS Certified ML Specialty Study Guide – Safety in Generative AI