$n$ moles of an ideal gas undergo a process $A \rightarrow B$ as shown in the figure. Maximum temperature of the gas during the process is\\
(1) $\frac{9P_{0}V_{0}}{nR}$\\
(2) $\frac{3P_{0}V_{0}}{2nR}$\\
(3) $\frac{9P_{0}V_{0}}{2nR}$\\
(4) $\frac{9P_{0}V_{0}}{4nR}$