which database operation would you need the database to be in the MOUNT state?

For which database operation would you need the database to be in the MOUNT state?

A.
Dropping a user in your database

B.
Dropping a tablespace in your database

C.
Configuring the database instance to operate in the ARCHIVELOG or NOARCHIVELOG modes

D.
Renaming the control files

E.
Re-creating the control files