Assertion :When two systems which are in thermal equilibrium with a third system, then all systems will be in thermal equilibrium with each other. Reason: The heat flows spontaneously from a system at a higher temperature to a lower temperature in a system.
a. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
b. Both Assertion and Reason are correct, but Reason is not the correct explanation for Assertion
c. Assertion is correct, but Reason is incorrect
d. Assertion is incorrect, but Reason is correct