Assertion: The efficiency of a heat engine cannot be greater than the efficiency of a Carnot engine.
Reason: The efficiency of any engine is never 100%.
(1) If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
(2) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
(3) If Assertion is true, but Reason is false.
(4) If Assertion is false but Reason is true.