A process on one mole of an ideal gas is defined as follow:
$$
\begin{aligned}
\left(P_{A}, V_{A}, T_{A}\right) & \longrightarrow\left(P=a, V=2 V_{A}, T=T_{A}\right) \\
& \longrightarrow\left(P_{1}=P, V_{1}=2 V_{A}, T_{1}=b\right) \\
& \longrightarrow\left(P_{2}=P_{A}, V_{2}=V_{A}, T_{2}=c\right)
\end{aligned}
$$
The values of $a, b$, and $c$ are :
(a) $\left(\frac{P_{A}}{2}, \frac{T_{A}}{2}, T_{A}\right)$
(b) $\left(P_{A}, T_{A}, T_{A}\right)$
(c) $\left(\frac{P_{A}}{4}, \frac{T_{A}}{4,} \frac{T_{A}}{3}\right)$
(d) none of these