Refer to the exhibit. What is the status of the L2 tunnel between PE1, PE2, and the Layer 2 switches? 

Answer options:

A. The Layer 2 tunnel is up, but no BPDUs are exchanged unless an extra configuration is applied.
B. The Layer 2 tunnel is up, and SW1 becomes the route bridge for VLAN 10.
C. The Layer 2 tunnel is down, due to the MTU mismatch between SW1 andSW2.
D. The Layer 2 tunnel is down, due to the ACL that is applied on the PE2 interface.

B