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.