The hybridisation of atomic orbitals of nitrogen in $NO_2^{+},NO_3^{-}$ and $NH_4^{+}$ are

Question

$(a)\;sp,sp^2\;and\;sp^3\;respectively \\ (b)\;sp,sp^3\;and \;sp^2\;respectively \\(c)\;sp^2,sp\;and\;sp^3\;respectively \\(d)\;sp^2,sp^3\;and \;sp\;respectively$