whats this I need to multiply polynomials

$({12mn}^{2})({2m}^{2}n)(mn)$

${12mn}^{2}({2m}^{2}n)mn$

$12\times2\times{m}^{2}\times m\times m\times{n}^{2}\times n\times n$

$24\times{m}^{2}\times m\times m\times{n}^{2}\times n\times n$

$24\times{m}^{3}\times m\times{n}^{2}\times n\times n$

$24\times{m}^{4}\times{n}^{2}\times n\times n$

$24\times{m}^{4}\times{n}^{3}\times n$

$24\times{m}^{4}\times{n}^{4}$

$24{m}^{4}{n}^{4}$