Final answer:
Positive logic is the most commonly used logic in digital electronics, with a high voltage representing a '1' (true/ON) state and a low voltage representing a '0' (false/OFF) state.
Step-by-step explanation:
The logic most often used in digital electronics is c) Positive logic. In positive logic, a high voltage level (usually referred to as '1') represents a true or ON state, while a low voltage level (referred to as '0') represents a false or OFF state. This convention is widely used because it is intuitive; higher voltage is often associated with an 'on' or active state in various systems beyond electronics. It's important to note that the choice between positive and negative logic is primarily a matter of convention and system design. Both can be used effectively, but positive logic is more common in the design of digital electronic systems.