Which two statements about MPLS point-to-multipoint traffic engineering （P2MP TE） are true？ （）

• A、P2MP TE uses an OSPF extension that is different from the OSPF extension that is used in P2P TE
• B、Loose path is not supported in P2MP TE
• C、Multiple IP multicast groups can map to one P2MP tunnel
• D、Affinity is not supported in P2MP TE
• E、P2MP TE uses Constrained Shortest Path First （CSPF） to calculate paths