Assertion (A) : All constant entropy processes are adiabatic, but all adiabatic processes are not isentropic.
Reason (R) : An adiabatic process which resists the exchange of energy to the
surroundings may have irreversibility due to friction and heat conduction.
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