Which statement about electronic programmable logic device image upgrades

A.
You can execute an upgrade or downgrade only from the active supervisor module.

B.
FPLD and ISSU image upgrades are nondisruptive.

C.
Whether the module being upgraded is online or offline, only the EPLD images that have different
current and new versions are upgraded.

D.
An EPLD upgrade must be performed during an ISSU system or kickstart upgrade.

Explanation:

http://www.cisco.com/en/US/docs/switches/datacenter/sw/5_x/epld/epld_rn_5.1.pdf