The ${\mathrm{p}}^{{\mathrm{k}}_{\mathrm{b}}}$ of dimethylamine and ${\mathrm{p}}^{{\mathrm{k}}_{\mathrm{a}}}$ of acetic acid are 3.27 and 4.77 respectively at T (K). The correct option for the pH of dimethylammonium acetate solution is: