Assertion (A): $\oint \frac{\delta Q}{T} = 0$, the cycle is reversible
Reason (R): $\oint \frac{\delta Q}{T} = 0$, the cycle is irreversible and possible
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