What units can be used to represent signal level values?

The correct answer is based on the conventions used in telecommunications and signal processing to represent signal levels. Signal level values can effectively be conveyed using units that specifically quantify electrical signals and power.

Millivolt (mV) is a unit of voltage that is commonly used to express minor voltage levels in electrical signals. It is crucial in telecommunications for measuring signal amplitudes with high precision.

Decibel millivolt (dBmV) is a logarithmic unit specifically designed to express voltage levels in relation to a reference value, typically 1 millivolt. This unit is frequently utilized in communication systems to convey the strength of a signal in dB, offering a more easily understood scale for comparing different signal levels.

Microwatt (µW) is a unit of power equivalent to one millionth of a watt. This unit is relevant in contexts where signal strength is analyzed in terms of the power delivered by the transmitted signal.

Together, these units represent critical metrics in assessing signal levels, which is essential for ensuring optimal performance and quality in communication systems. The inclusion of voltage and power-specific units makes option C the correct choice for this question.