Refer to the exhibit and the following connectivity requirements. Which type of MPLS VPN is being implemented? Sites CE1A and CE1B require connectivity to each other.Sites CE2A and CE2B require connectivity to each other.Site CE1C requires connectivity to sites CE1A, CE1B, CE3A, and CE3B. Site CE2C requires connectivity to sites CE2A, CE2B, CE3A, and CE3B. Sites CE3A and CE3B require connectivity to each other and to CE1C and CE2C.
Exhibit:

A.
central services MPLS VPN

B.
overlapping MPLS VPN

C.
simple VPN

D.
combinations of overlapping and central services MPLS VPN

E.
combinations of simple and central services MPLS VPN