Assertion (A): Heat can not spontaneously pass from a colder system to a hotter system without simultaneously producing other effects in the surroundings.
Reason (R): External work must be put into heat pump so that heat cann be transferred from a cold to a hot body.
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