Which two statements are correct?

In a design session, a colleague makes the following comments about cluster support for
Oracle SOA Suite 11g application. Which two statements are correct?

A.
A cluster appears to clients as multiple WebLogic Server instances

B.
The server instances in a cluster must all run on the same machine.

C.
You can scale a cluster by adding machines to the cluster to host additional server
instances.

D.
Server instances in a cluster can run different versions of WebLogic Server.

E.
You can create it cluster by using WLST, the WebLogic Server Administration
Console or Enterprise Manager Fusion Middleware Control.

Explanation: