A technician implements a new copper connection to Gi2/0/20.
Which command should be used to check the cable length?
A. test tdr copper-length gigabitethernet 2/0/20
B. test copper-length tdr gigabitethernet 2/0/20
C. test tdr copper-port gigabitethernet 2/0/20
D. test copper-port tdr gigabitethernet 2/0/20