What Is the Size of the Matrix $\left[\begin{array}{rrrr}12 & -4 & 9 & 5 \\ 9 & 10 & 9 & 7 \\ 7 & 0 & -5 & 17\end{array}\right]$

Multiple Choice

What is the size of the matrix?
$\left[\begin{array}{rrrr}12 & -4 & 9 & 5 \\ 9 & 10 & 9 & 7 \\ 7 & 0 & -5 & 17\end{array}\right]$

A) $3 \times 3$
B) $4 \times 3$
C) $4 \times 4$
D) $3 \times 4$