Which of the following is not true for the Carnot cycle? (The integral is the path integral over the entire cycle.) 1) intergral of dt=0 2)integral of dV=0 3) intergral of dP=0 4) intergral of deltaQ=0 5) intergral of dU=0 6) intergral of dA=0 when A is the Helmholtz free energy