What validates a Boolean variable?

A Boolean variable is specifically designed to hold one of two possible values: true or false. This binary nature of Boolean variables is foundational in computer science and programming, where they are used to represent truth values in logical expressions and decision-making processes.

In programming, a true value often indicates the affirmative condition, while a false value indicates the negative condition. This distinction allows for clear logical operations and control flow in algorithms, making it essential for tasks such as condition checking in if statements or loop controls.

The other options—positive or negative, whole numbers, and decimal values—pertain to different data types and numerical representations. They do not apply to Boolean variables, which are strictly limited to the binary framework of true and false. Therefore, the option that validates a Boolean variable correctly is indeed true or false.