Which Is the Primary Function of a MPLS L3 VPN

Which is the primary function of a MPLS L3 VPN route target?

A) It imports and exports identified routes into selected VRFs.
B) It uniquely identifies NLRIs that have the same numeric value.
C) It imports the external routes it identifies into VRFs that support Internet traffic
D) It supports QoS by classifying traffic by file type when it applies MPLS EXP bits to each packet.