Answer:
Demarc Extension.
Step-by-step explanation:
In this scenario, you have a network that occupies the top floor of a three-story building. The wide area network (WAN) service provider has installed the line for the WAN service in a wiring closet on the main floor.
Hence, you would use the Demarc Extension to relocate the WAN line into a wiring closet on your floor.
A Demarc Extension refers to a cabling channel or transmission path which typically originates from the interface of an internet service provider known as demarcation point to the termination point present at the premises of the end users, usually far from the minimum point of entry (MPOE).