The Sizes of Two Matrices a and B Are Given $A$

Multiple Choice

The sizes of two matrices A and B are given. Find the sizes of the product AB and the product BA, whenever these
products exist.
- $A$ is $4 \times 2$ , and B is $4 \times 2$ .

A) $2 \times 4 ; 4 \times 2$
B) $\mathrm{AB}$ does not exist; $\mathrm{BA}$ does not exist.
C) $4 \times 4 ; 2 \times 2$
D) $4 \times 2 ; 2 \times 4$