When accessing a gigabit connection, which step is the first?

When accessing a gigabit connection, which step is the first?

A.
Change the CAT3 cable to RG-58 cable.

B.
Change the CAT5 cable to a CAT6 cable.

C.
Change the CAT5 cable to a CAT5 Crossover cable.

D.
Change the CAT5 cable to a CAT3 cable.