Which of the following represents a logical negation?

The correct representation of logical negation is indicated by the symbol "!". In computer science and mathematics, logical negation is a fundamental operation that reverses the truth value of a proposition. If a proposition is true, applying negation makes it false, and vice versa.

For instance, if you have a boolean expression that evaluates to true, applying negation will change its value to false, which is essential for logical operations and control structures in programming. The exclamation mark is widely recognized and utilized in various programming languages to denote negation, such as C, C++, Java, and Python, which makes it the most accurate choice in this context.

The other choices do not represent logical negation. While they may be letters or symbols, they do not hold any standard meaning in the context of logical operations or boolean algebra. Therefore, the exclamation mark is clearly identified as the symbol that performs the logical negation function effectively.