The two opposite angular points of a square are $(3,4)$ and $(1,-1)$ the coordinates of the remaining angular points are ________

Question

$\begin{array}{1 1}(A) \;\bigg(\large\frac{-9}{2} ,\frac{1}{2} \bigg),\bigg(\large\frac{-1}{2} ,\frac{5}{2} \bigg)\\(B)\;\bigg(\large\frac{9}{2} ,\frac{-1}{2} \bigg),\bigg(\large\frac{-1}{2} ,\frac{-5}{2} \bigg) \\(C)\;\bigg(\large\frac{-9}{2} ,\frac{-1}{2} \bigg),\bigg(\large\frac{1}{2} ,\frac{-5}{2} \bigg)\\(D)\;\bigg(\large\frac{9}{2} ,\frac{1}{2} \bigg),\bigg(\large\frac{-1}{2} ,\frac{5}{2} \bigg)\end{array}$