C$.$ Jim is expending his business and has purchased another office building $2$km away for $200$ new staff. The new office needs to be connected to the main office so that staff can access the file servers and databases located at the main office.

a$.$ Single mode fibre optic.

b$.$ Category $6$ unshielded twisted pair.

c$.$ Category $5$ unshielded twisted pair.

d$.$ Multimode fibre optic