Which two statements are true about Oracle Weblogic Clustering ？ （）

A. WLS instances must be in a Cluster for In-Memory HTTP Session Replication to function  
B. WLS supports only hardware load balancing to ensure HA access for HTTP/Web clients
C. The servers must be running on the same port number
D. Make sure your Admin Server configuration and related files reside on a HA file system or some other backup/recovery strategy is in place