Which two steps are needed to set up Failover support for an OBIEE deployment?

Which two steps are needed to set up Failover support for an OBIEE deployment?

A.
Use Installer to affect Horizontal scale out of an existing instance

B.
Employ WebLogic Enterprise Edition, licensed separately

C.
Use Installer to set up separate single instances, then apply Horizontal scale out clustering

D.
Apply OBIEE Clustering option

E.
Leverage spare hardware capacity of single machine by using Vertical scale out option

Explanation:
Horizonal Scaleout of System Components
* Used for adding additional managed servers (Java components) and
system components to an existing cluster
* Used for scalability and failover
* Set up via the Universal Installer > Scale Out BI System option