What describes the Cutover operation for a File Import session?

What describes the Cutover operation for a File Import session?
A . Client access to data is switched to the target Unity system and the session can be rolled back if Canceled.
B . Production data access is (ram Unity but the clients still connect to the interface of the VN
D . Production data access is permanently set on Unity and the original data is deleted from VN
F . Client access to data is switched to the target Unity system and the session cannot be rolled back or Canceled.

Answer: A