Which property defines the two states of a digital circuit?

The property that defines the two states of a digital circuit is high or low. In digital electronics, a circuit typically operates using binary values, where high represents a logical "1" and low represents a logical "0". This binary representation is fundamental to digital systems, as it aligns with the way transistors and logic gates function. High voltage levels correspond to the "true" state, while low voltage levels indicate the "false" state.

Using high and low allows for consistent communication between different components in a digital circuit, as it standardizes how signals are interpreted. It can also simplify the design and analysis of digital systems by framing operations in terms of binary logic, essential for program execution and data processing.

Other terms like on or off, open or closed, or positive or negative can illustrate certain binary concepts, but they do not encapsulate the standard binary logic levels universally employed in digital circuitry. High and low, however, directly map to the voltage states that dictate the behavior of digital circuits, making it the most appropriate choice in this context.