Answer:
B. area code and number
Step-by-step explanation:
Conference call refers to a form of communication either via telephonic or through any other electronic media. In this form of communication, many people are joined. There is a host who is the organizer of the call. The other members are provided with a specific code or id through which they can join the meeting. Long-distance meetings with people all around the world have been possible because of the conference call. The area code and the contact number of each participant of the call are to be listed before making the conference calls.