what differentiates a U-PE from N-PE?

Which option describes what differentiates a U-PE from N-PE?

A.
U-PE has all BGP routes from different BGP AFIs.

B.
N-PE has VRF configured and exported via BGP.

C.
U-PE is configured to peer BGP with all other BGP neighbors.

D.
N-PE is used to physically connect customer edge routers.