I. The potential of individual half-cell can be measured.
II. Difference between the potentials of two half-cells can only be measured.
III. $\mathrm{Pt}\left(\mathrm{s}\right)\left|{\mathrm{H}}_2\left(\mathrm{g}\right)\right|{\mathrm{H}}^{+}\left(\mathrm{aq}\right)$ half - cell is called standard hydrogen electrode.
Select the correct statement(s) and choose the appropriate option

• A

  I and II

• B

  II and III

• C

  III and I

• D

  I, Il and III