The transition from the state $n = 4$ to $n = 3$ in a hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from\\
(1) $2 \rightarrow 1$\\
(2) $3 \rightarrow 2$\\
(3) $4 \rightarrow 2$\\
(4) $5 \rightarrow 4$