What Does Backbone Cabling Consist Of

What does backbone cabling consist of?

A) Short length cables with connectors at both ends.
B) It is cabling that connects workstations to the closest data room and to switches housed in the room.
C) The cables or wireless links that provide interconnection between the entrance facility and MDF, and between the MDF and IDFs.
D) The shielded cables that are used for high data transmission rates between an organization and an ISP.