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.