A system is taken from state A to state B along two different paths 1 and 2. The heat absorbed and work done by the system along these two paths are Q1 and Q2, and W1 and W2 respectively.
(a) Q1 = Q2
(b) W1 = W2
(c) Q1 - W1 = Q2 - W2
(d) Q1 + W1 = Q2 + W2
