问题：

[单选] Which of the following is true when considering the Server load-balancing design within the E-Commerce Module of the Enterprise Campus network？（）

A .  Routed mode requires the ACE run OSPF or EIGRP
B .  Bridged mode switches a packet between the public and the private subnets when it sees itsMAC address as the destination
C .  Two-armed mode will place the SLB inline to the servers， with different client-side and a server-side VLANs
D .  One-armed mode， which uses the same VLAN for the client， the ACE， and the servers， requiresa traffic-diversion mechanism to ensure the traffic return from the server passes though the ACE