What should you before replacing a drive in a HP P4000 hot-swap storage system?

A.
Remove and replace the drive since it is a hot-swap storage system and a drive can be replace
safely anytime

B.
Power-off the drive before you remove and replace it

C.
Check the Safe to Remove status from the CMC to verify that the drive can be remove

D.
Back up all the data of the RAID configured with the drive to be replace

Explanation:
You may remove and replace a disk from these hot-swap storage systems after
checking that the Safe to Remove status indicates “Yes” for the drive to be replaced. ( copied from
“P4000 SAN Solution User Guide ” Page 46)
http://bizsupport1.austin.hp.com/bc/docs/support/SupportManual/c03035314/c03035314.pdf