A network administrator is troubleshooting a client's device that cannot connect to the network. A physical
inspection of the switch shows the RJ45 is connected. The NIC shows no activity lights. The network
administrator moves the device to another location and connects to the network without issues. Which of the
following tools would be the BEST option for the network administrator to use to further troubleshoot?


A. Tone generator
B. Multimeter
C. Optical time-domain reflectometer
D. Cable tester