Matrix $\displaystyle {A}$ has the dimensions $\displaystyle {5}\times{4}$ and Matrix $\displaystyle {B}$ has the dimensions $\displaystyle {4}\times{3}$

What are the dimensions of the product $\displaystyle {A}{B}$ ?

$\displaystyle \times$
note: if multiplication is not possible put -1 in for both the row column dimensions