# Which are the species in which sulphur undergoes $sp^3$ hybridisation ?
$\begin{array}{1 1}(1)\;SF_4&(2)\;SCl_2\\(3)\;SO_4^{2-}&(4)\;H_2S\end{array}$
$\begin{array}{1 1}(a)\; 1\; and\; 3&(b)\; 2,3\; and\; 4\\(c)\; 1,2\; and\; 4&(d)\; 3 \;and\; 4\end{array}$