Which flavor of MPLS Layer 3 VPN has MPLS enabled on PE-CE links?

Which flavor of MPLS Layer 3 VPN has MPLS enabled on PE-CE links?

A.
basic

B.
CSC

C.
inter-AS

D.
AToM

E.
VPLS

Explanation:

http://www.cisco.com/en/US/docs/ios/12_0st/12_0st14/feature/guide/csc.html