Which statement about multicast VPN is true?

A.
The MDT group address should be the same for both address families in the same VRF.

B.
The MDT group address should be the same for both address families in the different VRFs.

C.
Configuration of the MDT source on a pre-VRF basis is supported only on IPv6.

D.
The MDT group address should be different for both address families in the same VRF.

Explanation:
Restrictions for Multicast VPN for Multicast Routing
• Configuration of the MDT source on a per-VRF basis is only supported on IPv4.
• The MDT group address should be the same for both the address families in the same
VRF.
Reference:
http://www.cisco.com/en/US/docs/routers/crs/software/crs_r4.3/configuration/guide/b_mcast_cg43
xcrs_chapter_01.html