Product of $6a^2 -7b +5ab $ and $2ab$ is

Question

$\begin{array}{1 1} 12a^3b-14ab^2+10ab \\ 12a^3b-14ab^2+10a^2b^2 \\ 6a^2-7b+7ab \\ 12a^2b-7ab^2+10ab \end{array} $