Which configuration will use line 3 of the administrator’s phone and line 4 of the manager’s phone to be an intercom line?

Refer to the exhibit. On SCCP phones, the Administrative Assistant for the Call Center Manager
wants to be able to inform her when a call is coming in or when customers or potential employees
have arrived for an interview. Which configuration will use line 3 of the administrator’s phone and
line 4 of the manager’s phone to be an intercom line?