Which are the functions of the route target on an MPLS VPN network?

Which are the functions of the route target on an MPLS VPN network?
A . Enable the peer PE to determine whichVPNv4 routes can be imported to the specified VR
C . Enable the peer PE to determine whichVPNv4 routes cannot be imported to the specified VR
E . Enable the peer CE to determine whichVPNv4 routes can be imported to the specified VR
G . Enable the peer CE to determine whichVPNv4 routes cannot be imported to the specified VR

Answer: AB