What is a possible reason for the error?

An administrator attempts to delete the network named Internet but receives an error.
What is a possible reason for the error?

A.
The network named Internet is backed by a port group on a vSphere Standard Switch.

B.
The vShield Edge appliance on the external network is powered off.

C.
The administrator needs to be an Organization Administrator.

D.
The network is still in use by an Organization.