Which of the following products are formed at cathode and anode during the electrolysis of an aqueous solution of MgSO₄ between inert electrodes?

• A

  ${\mathrm{O}}_2\left(\mathrm{g}\right)\text{ and }{\mathrm{SO}}_2\left(\mathrm{g}\right)$

• B

  ${\mathrm{O}}_2\left(\mathrm{g}\right)\text{ and }\mathrm{Mg}\left(\mathrm{s}\right)$

• C

  ${\mathrm{O}}_2\left(\mathrm{g}\right)\text{ and }{\mathrm{H}}_2\left(\mathrm{g}\right)$

• D

  ${\mathrm{H}}_2\left(\mathrm{g}\right)\text{ and }{\mathrm{O}}_2\left(\mathrm{g}\right)$