By default, to which time period can GSAN be rolled back?

GSAN just went down on the EMC Avamar server and is currently the backup window. EMC Support has indicated that the Avamar server will need to be rolled back. The checkpoints in the environment are completed automatically.

By default, to which time period can GSAN be rolled back?
A . During the last backup window
B . During the last maintenance window
C . When GSAN went down
D . Immediately after the last backup ran

Answer: B