Which statement about multicast VPN is true?()
- AThe MDT group address should be the same for both address families in the same VRF
- BThe MDT group address should be the same for both address families in the different VRFs
- CConfiguration of the MDT source on a pre-VRF basis is supported only on IPv6
- DThe MDT group address should be different for both address families in the same VRF