What is the cause of the ISSU failure when using the command show system internal csm global info?

Refer to the exhibit.

642-980-troubleshooting-cisco-data-center-unified-fabric-dcuft_img_066
What is the cause of the ISSU failure when using the command show system internal csm global info?
A. The command conf-t is holding a lock and not released it.
B. The SSN feature is not enabled on both switches.
C. The reference count is less than 1 due to a lack of successful config-sync.
D. It cannot be determined from the output.
E. An Administrator is logged in on another session and has a lock of the session data base to prevent ISSU.

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