. . . . . . . . operator reverses the truth value of the operation.

AND
OR
NOT
NAND

The correct answer is C. NOT.

The NOT operator reverses the truth value of the operation. For example, if the input is true, the output is false, and vice versa.

The AND operator returns true only if both inputs are true.

The OR operator returns true if either input is true.

The NAND operator returns true only if both inputs are false.