which type of MPLS VPN are customers A and B participating?

Exhibit:

Refer to the exhibit.
In which type of MPLS VPN are customers A and B participating?

A.
Overlapping MPLS VPN.

B.
Simple MPLS VPN.

C.
Central services MPLS VPN.

D.
Overlay MPLS VPN.

E.
Managed CE service MPLS VPN.