An administrator installs FortiClient EMS in the enterprise.

Understanding FortiClient EMS Components:

FortiClient EMS manages and configures endpoint security settings, while FortiClient installed on the endpoint enforces protection and checks security posture.

Evaluating Responsibilities:

FortiClient performs the actual enforcement of security policies and checks the security posture of the endpoint.

Conclusion:

The component responsible for enforcing protection and checking security posture is FortiClient (C).

References:

FortiClient EMS and endpoint security documentation from the study guides.