Assertion (A): The change in availability of a system is equal to the change in the Gibbs function of the system at constant temperature and pressure.
Reason (R): The Gibbs function is useful when evaluating the availability of systems in which chemical reactions occur.
a. Both A and R are individually true and R is the correct explanation of A.
b. Both A and R are individually true but R is not the correct explanation of A.
c. A is true but R is false
d. A is false but R is true