A doubly ionised Li atom is excited from its ground state $(n=1)$ to $n=3$ state. The wavelengths of the spectral lines are given by $\lambda_{32}$, $\lambda_{31}$ and $\lambda_{21}$. The ratio $\lambda_{32}/\lambda_{31}$ and $\lambda_{21}/\lambda_{31}$ are, respectively\\
(1) $8.1,\;0.67$\\
(2) $8.1,\;1.2$\\
(3) $6.4,\;1.2$\\
(4) $6.4,\;0.67$