Which action should you take to allow communication between Site-1 and Site-2?

Click the Exhibit button.

Referring to the exhibit, you have configured an L3VPN that connects Site-1 and Site-2 together, but the BGP routes are not showing up on the PE routers. The topology in this scenario is shown below.
Site-1 > PE-1 > P-1 > P-2 > PE-2 > Site-2
Which action should you take to allow communication between Site-1 and Site-2?
A. Enable LDP for all interfaces on all routes.
B. Change the route distinguisher to be different on PE-1 and PE-2.
C. Change the route target to match on PE-1 and PE-2.
D. Configure BGP on P-1 and P-2.