Google Updated Professional-Cloud-Architect Exam Questions and Answers by ashton

According to Google Cloud Compute Engine documentation , Spot VMs (formerly Preemptible VMs) are the most cost-effective choice for fault-tolerant, batch processing workloads. Since Altostrat’s jobs are " not time-critical " and can " tolerate occasional interruptions, " Spot VMs offer a significant discount—typically 60-91% —compared to standard on-demand prices.

The " Reliability and cost management " priority mentioned in the executive statement is directly addressed by utilizing the spare capacity that Spot VMs provide. While these instances can be reclaimed by Google Cloud at any time (preempted) with a 30-second notice, Altostrat’s batch processing architecture (likely running on GKE or managed in stance groups) can automatically reschedule these tasks when capacity becomes available again.

Option A (Reserved instances) requires a long-term commitment (1 or 3 years) and is better suited for predictable, constant workloads, not fluctuating batch jobs. Option C (Standard VMs) is unnecessarily expensive for workloads that do not require 100% uptime. Option D (Cloud Run functions) is excellent for event-driven, short-lived tasks but can become more expensive than Spot VMs for heavy, long-running batch computational demands. By leveraging Spot VMs, Altostrat achieves its goal of optimizing cloud storage and compute costs while maintaining the scalability required for its vast media library.

based on the requirement of secure and high-performance connection between on-premises systems to Google Cloud

https://cloud.google.com/network-connectivity/docs/interconnect/tutorials/partner-creating-9999-availability

Binary Authorization to ensure only verified containers are deployed To ensure deployment are secure and and consistent, automatically scan images for vulnerabilities with container analysis ( https://cloud.google.com/docs/ci-cd/overview?hl=en & skip_cache=true )

The case does not call out the throughput being an issue. However, to achieve 99.99%, you need to have 4 connections as per Google recommendations. However, in the options only A has the option to add an additional Interconnect connection. https://cloud.google.com/network-connectivity/docs/interconnect/concepts/dedicated-overview#availability