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、The user must be listed in the password file for the authentication.
• C、No special setup is needed for the user to connect as SYSDBA in iSQL*Plus.
• D、Set up a user in the Oracle Application Server Containers for J2EE （OC4J） user manager，and grant the webDba role to the user.