Which of the following statements about the communication process when you ping PC B from PC A are true?

Exhibit:

As shown in the figure, virtual private LAN service (VPLS) is enabled on routers PE 1 and PE 2. CEs are connected to PEs through QinQ and PC A and PC B are connected to the two CEs. The two PCs belong to the same VPN and can communicate with each other properly .

Which of the following statements about the communication process when you ping PC B from PC A are true?
A . PE 1 receives packets with a VLAN tag from CE 1 and adds a VLAN tag to these packets.
B . If the penultimate hop popping (PHP) feature of MPLS is enabled on PEs, a packet received by PE 2 from a P router has two VLAN tags one MPLS label.
C . PE 1 add two MPLS labels to a packet before sending the packet to a router.
D . A packet received by CE 2 from PE 2 has two VLAN tags CE 2 removed the outer tab and forwards the packets to PC B based on the inner tag

Answer: A, B, C