Which statement best describes a power inserter?

The correct answer highlights a key function of a power inserter in a network system. A power inserter is designed to allow radio frequency (RF) signals to pass through while simultaneously blocking low-frequency alternating current (AC) voltage. This is essential in many communication networks where RF signals need to be transmitted efficiently without interference from AC voltage, which could degrade the signal quality.

By routing RF signals and blocking low-frequency AC voltage, a power inserter ensures that the necessary power is delivered to powered devices, like amplifiers or other network elements, without compromising the integrity of the RF signals involved. This selective routing is crucial in maintaining the performance of the overall network.

The context for this involves understanding how different components in a network interact and the specific roles played by devices like power inserters in maintaining signal clarity and power delivery. For example, while filtering capabilities and amplification are features of various network devices, they are not the primary functions of a power inserter, which is why those options do not accurately describe its main characteristics.