You are a Database Administrator with WonderWeb. You use a password file to establish connections to the Sales database located on the server. You created the password file using the following command：        ORAPWD file=d：/oracle/ora9i/orapwU01 password=admin entries=4   You erroneously deleted the password file while the database was running. You re-create the password file using the following command：   ORAPWD file=d：/oracle/ora9i/orapwU01 password=change_on_install entries=4   However， when you try to connect as the SYS user， you receive the following error：        ORA-01031： insufficient privileges   What should you do to resolve this error？（）

• A、 Delete the newly created password file and re-create another password file with the password admin， without shutting down the database.
• B、 Enable the operating system authentication， shut down the database， disable the operating system authentication， and restart the database using the password file.
• C、 Enable the operating system authentication， shut down the database， re-create the password file using the same ORAPWD command， and restart the database using the password file.
• D、 Delete the newly created password file， enable operating system authentication and shut down the database. Then， re-create another password file using the same ORAPWD command and restart the database using this password file.