A system administrator receives a warning that their DPE I/O Module has a fault. In this situation, which type of
replacement is required?

A.
Hot-pluggable CRU

B.
Non-Hot-pluggable FRU

C.
Hot-pluggable FRU

D.
Non-Hot-pluggable CRU

Explanation:
Your storage system is designed to be powered on continuously. Most components are hot swappable; that is,
you can replace or install these components while the storage system is running.
http://corpusweb130.emc.com/upd_prod_AX4/UPDFinalPDF/en/
AX4_Replacing_a_Storage_Processor-_Master_1692986.pdf