Which of the following describes the nonreflective signatures of an optical time domain reflectometer (OTDR)?

The correct answer identifies the types of anomalies that an optical time domain reflectometer (OTDR) can detect based on their response to light signals being sent through fiber optic cables. Nonreflective signatures typically refer to the disturbances and losses that occur in the optical fiber system due to various factors like fusion splices, macrobends, and microbends.

Fusion splices are locations where two fiber ends are joined together, and they can introduce a nonreflective signature if done improperly, as they can create a slight loss in the signal. Macrobends and microbends are also important, as they describe the bending of fiber cables. Macrobends are large, gradual bends that can cause signal loss but do not introduce a significant reflective signature. Microbends, on the other hand, are tiny, often unnoticed bends that can also lead to signal loss and can be difficult to detect.

Understanding these factors is crucial for fiber optic technicians because they need to be able to identify and troubleshoot nonreflective events effectively. In contrast, the other choices do not represent the nonreflective characteristics. The wavelengths in choice C are relevant to the operation of OTDR but do not pertain to the nonreflective signatures. Task options in choice D refer