which three scenarios can Oracle Enterprise Manager Silent Mode installation be utilized?

For which three scenarios can Oracle Enterprise Manager Silent Mode installation be utilized?

A.
Installing Oracle Enterprise Manager using a new database

B.
Installing Oracle Enterprise Manager with Oracle Replication

C.
Installing an additional Oracle Management Service

D.
Installing Oracle Enterprise Manager plug-ins

E.
Installing Oracle Enterprise Manager using an existing database

Explanation:
You can perform the following in silent mode:
* (A)Installing Enterprise Manager Grid Control Using a New Database
* ( E)Installing Enterprise Manager Grid Control Using an Existing Database
* (C)Installing Additional Management Service

Installing Enterprise Manager 10g Grid Control Release 5 (10.2.0.5) Using Existing Oracle
Database 11g
Installing Additional Management Service Using Existing Oracle Database 11g
Note:
*Silent-mode installation is a noninteractive method of installing your software that requires the
use of an XML properties file for selecting installation options. You can run silent-mode installation
in either of two ways: as part of a script or from the command line. Silent-mode installation is a
way of setting installation configurations only once and then using those configurations to
duplicate the installation on many computers.
Reference:Installing Enterprise Manager Grid Control