What is the impact of MPLS VPN on CE-routers?

A.
The CE-routers are not MPLS VPN aware.

B.
The CE-routers must support the same IGP as the P-network.

C.
The CE-routers must use EBGP as the CE to PE routing protocol.

D.
The CE-routers must be upgraded to version 12.0 or later to support MPLS.