\( \text{If } A = \begin{bmatrix} 2 & 1 \\ 3 & 4 \end{bmatrix} \text{ and } B = \begin{bmatrix} 1 & 0 \\ 2 & 1 \end{bmatrix}, \text{ then } A + B \text{ is equal to:} \)
\( \text{(A) } \begin{bmatrix} 3 & 1 \\ 5 & 5 \end{bmatrix} \quad \text{(B) } \begin{bmatrix} 1 & 1 \\ 1 & 3 \end{bmatrix} \quad \text{(C) } \begin{bmatrix} 2 & 0 \\ 6 & 4 \end{bmatrix} \quad \text{(D) } \begin{bmatrix} 3 & 1 \\ 5 & 4 \end{bmatrix} \)
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