Which component would typically receive a digital output signal for operation?

The solenoid valve is designed to operate using digital output signals, typically from a control system or microcontroller. This type of valve, when energized, moves in a precise manner—either opening or closing based on the binary signal it receives (often just on or off). Digital signals are advantageous for solenoid operation as they provide a clear, distinct state change, allowing for quick response times and reliable functionality.

In contrast, an analog gauge measures a continuous range of values and would not effectively respond to a digital signal, which only represents distinct states. Similarly, a variable resistor, which adjusts resistance in response to an applied voltage or current to control signals, operates on analog principles rather than digital ones. A displacement sensor typically provides data in analog form to measure position, movement, or displacement, which would not interface directly with a digital output signal for operational control. The unique functionality of the solenoid valve to act upon a digital signal makes it the correct choice in this context.