Find the Dimension of the Matrix $$\left[ \begin{array} { r r r } - 7 & 0 & 0 \\- 9 & - 7 & 0 \\- 2 & 4 & - 7\end{array} \right]$$

Multiple Choice

Find the dimension of the matrix.
- $$\left[ \begin{array} { r r r } - 7 & 0 & 0 \\- 9 & - 7 & 0 \\- 2 & 4 & - 7\end{array} \right]$$

A) 9
B) $- 7$
C) $3 \times 0$
D) $3 \times 3$