Which method is used to provide inter-AS AToM services?

A.
back-to-back VRF

B.
targeted LDP

C.
pseudowire stitching

D.
AToM interworking

E.
Cisco MPLS TE tunnels

F.
autodiscovery

Explanation:
http://www.cisco.com/en/US/docs/optical/cpt/r9_3/configuration/guide/cpt93_configuration_chapter
_0111.html