Which two statements correctly describe a situation in which an Active/Standby Service Module design is being used？ （）

A、 Troubleshooting is more complicated.

B、 Service and switch modules are underutilized.

C、 Layer 2 adjacency is required with the servers that use this design.

D、 Layer 3 adjacency is required with the servers that use this design.

E、 Load balancing will always occur across both access layer uplinks.