Refer to the exhibit.

After the “attach-mirror” command is successfully executed on device
“device_VNX0506_CSE__6_1”, the command “rebuild-status” shows an ongoing rebuild process
on the same device.
What is a possible cause?

A.
It is a normal behavior.when attaching a mirror, a rebuild process starts.

B.
The device “device_VNX0506_CSE__6_1” has an ongoing rebuild process for a previous
failure.

C.
The rebuild process is related to a director failure.

D.
The device mirror will start only after the rebuild process is completed.

Explanation: