Tan works for a telecommunications provider and noticed one of the communication links to a branch office 10 miles away has just gone down. Which of the following tools might help him determine what the problem could be?
a. Attach an attenuator to the fiber optic cable. b. Connect a multimeter to the fiber optic cable. c. Use an OTDR on the fiber optic cable. d. Use a tone generator on the fiber optic cable.