Which two statements describe GRE? (Choose two.)

A.
GRE acts as passenger protocol for a Layer 3 transport protocol.

B.
GRE acts as a tunneling protocol and encapsulates other protocols.

C.
GRE provides data confidentiality.

D.
Packet MTU must be adjusted to accommodate GRE overhead.

E.
GRE does not allow multicast to be sent across the tunnel.

F.
The GRE tunnel interface remains down until it can see the remote tunnel end.