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.

Answer: D

Explanation: You can upgrade (or downgrade) EPLDs using CLI commands on the Nexus 7000 Series device. Follow these guidelines when you upgrade or downgrade EPLDs:

•

You can execute an upgrade from the active supervisor module only. All the modules, including the active supervisor module, can be updated individually.

•

You can individually update each module whether it is online or offline as follows:

C

If you upgrade EPLD images on an online module, only the EPLD images with version numbers that differ from the new EPLD images are upgraded.

C

If you upgrade EPLD images on an offline module, all of the EPLD images are upgraded.

•

On a system that has two supervisor modules, upgrade the EPLDs for the standby supervisor and then switch the active supervisor to standby mode to upgrade its EPLDs. On a system that has only one supervisor module, you can upgrade the active supervisor, but this will disrupt its operations during the upgrade.

•

If you interrupt an upgrade, you must upgrade the module that is being upgraded again.

•

The upgrade process disrupts traffic on the targeted module.

•

Do not insert or remove any modules while an EPLD upgrade is in progress.

Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/4_0/epld/release/notes/epld_rn.html