which statement is true?

In an Oracle BI Cluster Server environment which statement is true?

A.
BI Scheduler can reside outside Local Area Network (LAN) whereas the other components
(Clustered BI Servers, Master BI Server, BI Cluster Manager) of Oracle BI Cluster Server must
reside on the same LAN.

B.
Clustered BI Servers, Master BI Server, BI Scheduler and Cluster Manager all need to reside in
one Local Area Network (LAN).

C.
Cluster Manager can reside outside Local Area Network (LAN) whereas the other components
(Clustered BI Servers, Master BI Server, BI Scheduler) of Oracle BI Cluster Server must reside on
the same LAN.

D.
All components of an Oracle BI Cluster Server environment may exist on different Local Area
Networks (LANs), provided the LAN are connected through a single Wide Area Network (WAN).