what is the reason for the failed connection?

Refer to the Exhibit.
Your company is connecting a third VPLS site to your existing VPLS core. The new connection is
not working and you have been asked to resolve the problem.
Referring to the exhibit, what is the reason for the failed connection?

A.
The configured CE facing interface is not installed in the chassis.

B.
The PE1 and PE2 routers must be configured not to encapsulate the packets to PE3.

C.
The PE3 router needs an active tunnel services interface in the chassis.

D.
The PE3 router needs vrf-table-label enabled for these connections.

Explanation: