Let , And $\vec{v}=(1,2,3)$ Which of the
Following Are Defined $\mathbf{A}+\mathbf{B}$

Multiple Choice

Let $\mathbf{A}=\left(\begin{array}{cc}4 & 5 \\ -1 & 0\end{array}\right) , \mathbf{B}=\left(\begin{array}{ccc}1 & -1 & 2 \\ 3 & 4 & 0 \\ -2 & 1 & 8\end{array}\right) , \vec{u}=(1,2)$ , and $\vec{v}=(1,2,3)$ . Which of the
Following are defined.

A) $\mathbf{A}+\mathbf{B}$
B) $\mathbf{A} \vec{u}$
C) $\overrightarrow{\mathbf{B}} \vec{v}$
D) $(\vec{v} \cdot \vec{v}) \mathbf{A}$
E) $\vec{u}+\vec{v}$
F) $\frac{\overrightarrow{\mathbf{B}} \hat{v}}{\vec{u} \cdot \vec{u}}$