Calculate the frequency of the spectral line emitted when the electron in n=3 in H-atom de-excites to ground state.$(R_H=109737/cm)$

Question

$\begin{array}{1 1}(a)\;2.92\times 10^{15}/sec&(b)\;1.32\times 10^{16}/sec\\(c)\;3.4\times 10^{17}/sec&(d)\;1.32\times 10^{15}/sec\end{array}$