Which of the following is a GRE Tunnel characteristic?

A.
GRE impose more CPU overhead than IPSec on VPN gateways

B.
GRE tunnels can run through IPsec tunnels.

C.
GRE Tunnel doesn’t have support for IPv6

D.
GRE consists of two sub-protocols: Encapsulated Security Payload (ESP) and
Authentication Header (AH).