Which of the following is true as to the resolving this issue?

The negotiation prior to the establishment of a VPN tunnel might result in the production of large packets. Some NAT devices may not fragment large packets correctly making the connection impossible. Which of the following is true as to the resolving this issue?

A.
IKE over TCP can be used to solve the problem, though this problem is resolved during IKE phase 2

B.
If using NAT-T, you can use Aggressive Mode

C.
UDP Encapsulation method uses port number 2746 to resolve this problem

D.
If using NAT-T, port 4500 must be enabled

E.
IKE over TCP can be used to solve the problem, though this problem is resolved during IKE phase I