What is the probable cause of the network issues?

An administrator finds that after creating an External Network for an Organization vDC, virtual

machines are unable to communicate using the new network.
The administrator confirms that the virtual machines are able to communicate to the Edge
Gateway, but the Edge Gateway is unable to ping its Default Gateway.
What is the probable cause of the network issues?

A.
A firewall rule on the Edge Gateway is set to deny all traffic.

B.
The NAT service is not configured properly on the Edge Gateway.

C.
The Promiscuous Mode policy on the vSphere Port Group is set to Reject.

D.
An incorrect VLAN is configured on the vSphere Port Group.