What operation reverses the logic state of its input?

The operation that reverses the logic state of its input is the NOT operation. In digital logic, the NOT gate, also known as an inverter, takes a single binary input and outputs the opposite value. If the input is 1 (true), the output becomes 0 (false), and if the input is 0 (false), the output becomes 1 (true). This characteristic is a fundamental aspect of logic gates and is essential in creating more complex logical operations.

In contrast, the other operations have different behaviors. The AND operation outputs true only when both of its inputs are true. The OR operation outputs true if at least one of its inputs is true. The XOR (exclusive OR) operation outputs true if one input is true and the other is false but not both. Therefore, the NOT operation uniquely serves the function of reversing its input's logic state, making it the correct choice.