Which step do you need to perform to enable a user with the SYSDBA privilege to log in as SYSDBA in iSQL*Plus?

Which step do you need to perform to enable a user with the SYSDBA privilege to log in as SYSDBA in iSQL*Plus?

A.
The user must be granted the database administrator (DBA) privilege.

B.
Set up a user in the Oracle Application Server Containers for J2EE (OC4J) user manager, and grant the webDba role to the user.

C.
The user must be listed in the password file for the authentication.

D.
No special setup is needed for the user to connect as SYSDBA in iSQL*Plus.