How are route targets used to build virtual routing tables in the PE-routers?

A.
Route targets are prepended to each entry in the VRF to identify which VPN owns the route.

B.
Route targets are prepended to the customer’s IP address to create unique address spacing for each VPN.

C.
Every customer route exported from a VRF is tagged with appropriate export route targets. VPN routes received by a PE-router are matched against import route targets configured in a CRF.

D.
Every customer route received from the CE is matched against import route targets. If there is match, the route is added to the VRF. Every route received from the neighbor PE-router is entered in the VRF. It is then matched against export route targets.

Explanation:
Route distinguisher is prepended to IP address to create VPN address, not Route target.