The maximum number of $90^{\circ}$ angles between bond pair of electrons is observed in

Question

$\begin{array}{1 1} (a)\; \;dsp^3\;hybridization \\ (b)\; \;sp^3d^2\;hybridization\\ (c)\; \;dsp^2\;hybridization \\ (d)\;sp^3d\;hybridization \end{array}$