Which three statements about MPLS VRFs are true? (Choose three)

A.
Only on interface can be assigned to a single VRF.

B.
Only one VRF can be assigned to a single interface.

C.
A VRF is a routing and forwarding instance for a VPN.

D.
VPN sites share a VRF if they are in an overlapping VPN.

E.
A single VPN site or many VPN sites can share the same VRF as long as these sites share exactly the same connectivity requirements.

Explanation:

B: You can have multiple interfaces associated with a VRF. But only one VRF associated with a particular interface (meaning an interface cannot be associated with multiple VRFs).
E (not D): According to the "Implementing Cisco MPLS" Student Guide (Text Part Number: 97-1154-01) Volume 2, version 1.0, page 7-64 Impact of complex VPN topologies on Virtual Routing Tables:
– A virtual routing table in a PE router can be used only for sites with identical connectivity requirements.