Which cause of the issue is true?

Refer to the exhibit.

You attempt to delete the N7K-1 VDC, the operation is unsuccessful.
Which cause of the issue is true?
A. You are logged in as vdc-admin.
B. Custom resource allocations are assigned in the VDC.
C. N7K-1 is the default VDC.
D. Interfaces are assigned to N7K-1.