多项选择题

Which two statements are true about the WebLogic Cluster ？（）

A. Clustered Servers capacity can be increased by adding new server instance to the cluster on an existing machine
B. Clustered Servers can be on a same or different machine with same operating system only
C. Clustered Servers can only be on a same machine or different operating system
D. Clustered Servers can be on a same or different machine with same or different operating system

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