Redox Reactions

Identify the correct statements about the following stoichiometric equation.

\(a \mathrm{P}_4+b^{-} \mathrm{OH}+c \mathrm{H}_2 \mathrm{O} \longrightarrow d \mathrm{PH}_3+e \mathrm{H}_2 \mathrm{PO}_2^{-}\)

I. $a+b+c=5$

II. $b+c-e=3$

III. The oxidation state of P in $\mathrm{H}_2 \mathrm{PO}_2^{-}$is +l .