Which two requirements to deploy 6PE and 6VPE solutions are mandatory? (Choose two.)

A.
MPLS is enabled on the core, distribution, and edge devices.

B.
A triple stack is enabled on PE devices.

C.
The network has at least six PE devices.

D.
A dual stack is enabled on all the P and PE devices in a network.

Explanation:
http://www.cisco.com/en/US/docs/wireless/asr_901/Configuration/Guide/6pe_6vpe.html