You are about to install Oracle Database 12c Enterprise Edition. Which statement is true? 

Answer options:

A. You should not install the Oracle Database software into an existing Oracle home from a different release.
B. A multitenant container database (CDB) can have several pluggable databases (PDBs) with different character sets.
C. Oracle recommends that you back up the root. sh script after you complete the installation.
D. Cloning an Oracle home is useful if you are performing multiple Oracle Database Installations.
E. You can stop existing Oracle processes, including the listener and the database running in the Oracle home, before the database software installation.

A

https://docs.oracle.com/database/121/NLSPG/ch2charset.htm#NLSPG1035