Which two files must you copy from the Oracle home of t…

Which two files must you copy from the Oracle home of the database that is being upgraded to the new Oracle
home for Oracle Database 12c? (Choose three.)

A.
the tnsnames.ora file

B.
the sqlnet.ora file

C.
the initialization parameter file

D.
the password file

E.
the listener.ora file

Explanation:
https://docs.oracle.com/cd/E11882_01/server.112/e23633/afterup.htm#UPGRD52747