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