The correct answer is A. The primary purpose of Access Control Policy is to control access to network resources. It defines which sources, destinations, users, services, applications, URLs, VPN communities, and content conditions are allowed, blocked, rejected, or handled by another action. Option B is incomplete because monitoring is performed through logging and monitoring tools; Access Control may generate logs, but its primary function is enforcement. Option C is wrong because Threat Prevention is a separate policy area containing protections such as IPS, Anti-Bot, Anti-Virus, and Threat Emulation/SandBlast capabilities. Option D is wrong because user accounts are managed through administrator/account management and identity infrastructure, not Access Control Policy itself. In R82, Access Control combines blades such as Firewall, Application Control, URL Filtering, Content Awareness, Identity Awareness, Mobile Access, and VPN-related access controls into a unified rulebase. Reference topics: Access Control Policy, Firewall, Application and URL Filtering, Identity Awareness, Content Awareness.