Assertion (A): For a mixture of solid, liquid and vapour phases of a pure substance in equilibrium the number of independent intrinsic properties needed is equal to one.
Reason (R): The three phases can coexist only at one particular pressure.
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