When maintaining Customer Replaceable Units (CRUs) in a PowerScale node, what is important to ensure?

When maintaining Customer Replaceable Units (CRUs) in a PowerScale node, what is important to ensure?
A . The cluster is in maintenance mode.
B . Proper static electricity discharge procedures are followed.
C . The firmware is updated post-installation.
D . All CRUs are tested individually before installation.

Answer: B