Hydrogen And Its Compounds

Which of the following reactions give $\mathrm{H}_2$ as one of the products?

(Reactions are not balanced)

I. $\mathrm{NaBH}_4+\mathrm{I}_2 \longrightarrow$

II. $\mathrm{B}_2 \mathrm{H}_6+\mathrm{N}\left(\mathrm{CH}_3\right)_3 \rightarrow$

III. $\mathrm{Al}+\mathrm{NaOH}+\mathrm{H}_2 \mathrm{O} \longrightarrow$

IV. $\mathrm{BF}_3+\mathrm{NaH} \longrightarrow$