What is the cause of this error?

An administrator receives the error:
Unable to create vShield Edge VM
while using the Reset Network function on vApp or Organizational Networks. What is the cause of
this error?

A.
The vApp or Organizational Network name is too long.

B.
The vShield Edge VM resource pool is out of resources.

C.
The vShield Manager appliance is not registered to vCD.

D.
The vShield Manager appliance is not registered to vCenter.