Refer to the exhibit.

You are preparing to perform an upgrade on an unconfigured VPLEX Metro. When you run the ndu pre-check
command, it indicates that it has failed and there are no first upgraders. In your troubleshooting, you run the
version -a command.
Based on the output, what is the reason for the failure?

A.
health-check –full was not run

B.
Directors are at incompatible code levels

C.
ndu pre-check –force flag was not used

D.
Directors are not connected.