The Sizes of Two Matrices Are Given $\mathrm { A }$

The sizes of two matrices are given. Find the size of the product AB and the size of the product BA, if the given product
can be calculated.
- $\mathrm { A }$ is $2 \times 4 ; \mathrm { B }$ is $4 \times 2$

A) $\mathrm { AB }$ is $2 \times 2$ ; BA cannot be calculated.
B) $\mathrm { AB }$ is $4 \times 4$ ; BA is $2 \times 2$ .
C) AB cannot be calculated; BA is $4 \times 4$ .
D) $\mathrm { AB }$ is $2 \times 2$ ; BA is $4 \times 4$ .