Which of the following BEST describes the purpose of access management?

Providing a channel for users to request and receive standard services describes the Request Fulfillment process, not access management.

Access management is the process responsible for granting authorized users the right to use a service while preventing access by non-authorized users, as defined in ITIL Service Operation. It implements the policies set by information security management and manages user access rights throughout the identity lifecycle.

Preventing problems and resulting incidents from occurring is the purpose of Problem Management, which focuses on root cause analysis and error control.

Detecting security events and making sense of them describes security event monitoring or a SIEM solution, which is outside the defined scope of the ITIL access management process.