when does archiving initially occur?

Once data archiving has been enabled on the Cisco Security MARS appliance when does archiving initially occur?

A.
Data is archived when a configuration change occurs on the Cisco Security MARS.

B.
Data is archived via NFS when a new incident occurs.

C.
Whenever a new event is received, data will be archived via NFS.
PassGuide 642-545

D.
Data is archived nightly as a scheduled operation.