Compute the following: $\begin{bmatrix} a & b \\ -b & a \end{bmatrix} + \begin{bmatrix} a & b \\ b & a \end{bmatrix}$
- A$\begin{bmatrix} 2a & 2b \\ 0 & 2a \end{bmatrix}$
- B$\begin{bmatrix} 2a & 0 \\ 2b & 2a \end{bmatrix}$
- C$\begin{bmatrix} 2a & 2b \\ 2b & 2a \end{bmatrix}$
- D$\begin{bmatrix} 0 & 2b \\ 0 & 2a \end{bmatrix}$
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