Three processes compose a thermodynamic cycle shown in the accompanying PV diagram of an ideal gas.

Process `1 to 2` takes place at constant temperature `(300K)`. During this process `60J` of heat enters the system.
Process `2 to 3` takes place at constant volume. During this process `40J` of heat leaves the system.
Proces `3 to 1` is adiabatic `T_(3)` is `275K`
Which of the following statements is/are CORRECT?

Options

A. The change in internal energy of the system during process `3to1` is `+40J`
B. The change in internal energy of the system during proces `3 to 1` is 0
C. The change in internal energy of the system during cyclic process is `40J`
D. The change in internal energy of the system during cyclic process is 0