A thermodynamic system is taken from state \( A \) to \( B \) along...

A thermodynamic system is taken from state \( A \) to \( B \) along \( A C B \) and is brought back to \( A \) along \( B D A \) as shown in the \( P V \) diagram.
The net work done during the complete cycle is given
\( \mathrm{P} \) by the area
(a) \( P_{1} A C B P_{2} P_{1} \)
(b) \( A C B B^{\prime} A^{\prime} A \)
(c) \( A C B D A \)
(d) \( A D B B^{\prime} A^{\prime} A \)
(1992)