The number of $\sigma$ and $\pi$ bonds in $ClO_3$ respectively

Question

$\begin{array}{1 1}(a)\;4\sigma\;and\;2\pi\;bonds\\(b)\;only\;3\sigma\;bonds\\(c)\;only\;3\pi\;bonds\\(d)\;3\sigma\;and\;3\pi\;bonds\end{array}$