Which of the following is a measure of the disorder or randomness of a system?

Entropy (S) is a thermodynamic quantity that represents the measure of disorder or randomness in a system. In simple terms, it describes the amount of energy in a system that is unavailable for doing work. The concept is rooted in the idea that nature tends to move towards greater randomness or disorder. In a highly ordered state, like a crystal, the entropy is relatively low. As the system becomes more disordered, such as when a solid turns into a liquid or a gas, the entropy increases.