CompTIA Network+

Answer: D - To detect any light losses in the fiber optic cabling setup, Jack should use an OTDR.

Key Takeaway: Optical time-domain reflectometer (OTDR) is an optoelectronic instrument used to characterize an optical fiber. An OTDR injects a series of optical pulses into the fiber. From the same end of the fiber, it also extracts light that is scattered and reflected back from points in the fiber where the index of refraction changes.