Which two actions should be performed before physically replacing the shelf?

A customer has requested your assistance with replacing a DS224C disk shelf from their cluster nondisruptively.

Which two actions should be performed before physically replacing the shelf? (Choose two.)
A . Verify that the system is configured as multipath high availability.
B . Upgrade the IOMs in the shelf before starting the removal process.
C . Verify that the drives in the shelves are spares and ownership is removed.
D . Zero the disks before performing the physical shelf removal.

Answer: AC