Which statement about electronic programmable logic device image upgrades is true?

Which statement about electronic programmable logic device image upgrades is true?

A.
EPLD and ISSU image upgrades are nondisruptive.

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

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

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