What are the two states of a digital I/O signal?

In digital electronics, a digital input/output (I/O) signal operates based on binary states, where two distinct conditions represent information. The correct representation of these conditions is ON and OFF, correlating to the binary values of 1 and 0, respectively.

When a digital signal is in the ON state, it indicates an active or true condition, often corresponding to a voltage level that can be interpreted as a binary one (1). Conversely, when the signal is OFF, it signifies an inactive or false condition, representing a binary zero (0). This ON/OFF terminology is widely used in logic circuits and digital systems, as it intuitively describes the operating condition of a switch or signal.

While other options presented different terminology, they can reflect similar binary concepts but are not universally represented as standard terminology for I/O signals. "HIGH" and "LOW" correctly describe voltage levels but do not directly convey the action of the signal like ON/OFF does; thus, they do not encapsulate the signal state as clearly. "ACTIVE" and "INACTIVE" or "START" and "STOP" can also define signal states in certain contexts but are not the commonly recognized standard nomenclature for the basic digital I/O states. Therefore, ON