Which of the following equations is correct?

A. $\displaystyle{35}{{a}}^{{2}}{{b}}^{{4}}+{14}{{a}}^{{3}}{{b}}^{{6}}={7}{{a}}^{{2}}{{b}}^{{4}}{\left({5}+{2}{a}{{b}}^{{2}}\right)}\usepackage{cmbright}\Huge\$

B. $\displaystyle{35}{{a}}^{{2}}{{b}}^{{4}}+{14}{{a}}^{{3}}{{b}}^{{6}}={7}{{a}}^{{3}}{{b}}^{{6}}{\left({5}{a}{{b}}^{{2}}+{2}\right)}\usepackage{cmbright}\Huge\$