The correct answer is A. unary operator.
A unary operator is an operator that takes only one operand. The logical NOT operator, represented by !, is a unary operator that reverses the truth value of its operand. For example, if the operand is true, the result is false, and if the operand is false, the result is true.
A binary operator is an operator that takes two operands. Some examples of binary operators are addition (+), subtraction (-), multiplication (*), and division (/).
A ternary operator is an operator that takes three operands. The ternary operator is often used to represent conditional statements. The syntax for a ternary operator is condition ? true_value : false_value. If the condition is true, the true_value is returned; otherwise, the false_value is returned.
An octal operator is an operator that is used to represent octal numbers. Octal numbers are a base-8 number system. The digits in an octal number can be from 0 to 7.
None of the above is not a valid option.