An Engineer Changed a Configuration and Must Perform a Rollback

An engineer changed a configuration and must perform a rollback. Which statement applies to a Cisco Nexus 5600 Series Switch?

A) The configuration rollback functionality is disabled when FCoE is enabled.
B) A system checkpoint is generated automatically when the running configuration is saved to NVRAM.
C) A user who is assigned to the network-operator user role can perform a rollback.
D) Errors are skipped when an atomic rollback type is triggered.