You want your listener to be password protected to prevent it from being shut down. You want to accomplish this task while the listener is functional. Which method could you use to achieve this objective？（）

• A、 Use the CHANGE_PASSWORD command of the Listener control utility.
• B、 Use the SET PASSWORD and SAVE_CONFIG commands of the Listener control utility.
• C、 Use the CHANGE_PASSWORD and SAVE_CONFIG commands of the Listener control utility.
• D、 Manually modify the listener.ora file to include the password for the listener and restart the listener.