NOT is an example o the boolean operator. thus, option D is correct.
What is boolean operator?
Boolean Operators are simple words (AND, OR, NOT or AND NOT) used as conjunctions to combine or exclude keywords in a search, resulting in more focused and productive results. ... Proximity Operators (with, near and others) can also help you in searching. See Using Proximity Operators for more details and examples.
The logical NOT ( ! ) operator (logical complement, negation) takes truth to falsity and vice versa. It is typically used with boolean (logical) values. When used with non-Boolean values, it returns false if its single operand can be converted to true ; otherwise, returns true.
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