The pair in which phosphorous atoms have a formal oxidation state of $+ 3$ is :

Question

$\begin{array}{1 1} \text{(1)Orthophosphorous and pyrophosphorous acids} \\ \text{(2) Pyrophosphorous and hypophosphoric acids} \\ \text{(3) Orthophosphorous and hypophosphoric acids}\\ \text{(4) Pyrophosphorous and pyrophosphoric acids } \end{array}$