Glycerol (propane-1,2,3-triol) is treated with excess $\mathrm{HIO}{}_4$. Which row gives the correct moles of $\mathrm{HIO}{}_4$ consumed per mole of glycerol and the products?

1. A2 mol; 2 $\mathrm{HCHO}$ + 1 $\mathrm{HCOOH}$
2. B1 mol; $\mathrm{HCHO}$ + $\mathrm{HOCH}{}_2\mathrm{CHO}$
3. C2 mol; 3 $\mathrm{HCHO}$
4. D3 mol; 2 $\mathrm{HCHO}$ + 1 $\mathrm{HCOOH}$