Choose the One Alternative That Best Completes the Statement or Answers

Choose the one alternative that best completes the statement or answers the question.
Use a graphing utility to find the inverse of the matrix, if it exists. Round answers to two decimal places, if necessary.
- $$\left[ \begin{array} { r r r r } 1 & - 9 & 0 & 0 \\0 & 1 & - 7 & 0 \\0 & 0 & 1 & 1 \\0 & 0 & 0 & 1\end{array} \right]$$

A) $\left[ \begin{array} { r r r r } 1 & 0 & 0 & 0 \\ - 1 & 1 & 0 & 0 \\ 7 & 7 & 1 & 0 \\ - 63 & - 63 & 9 & 1 \end{array} \right]$

B) $\left[ \begin{array} { r r r r } 1 & 0 & 0 & 0 \\ 9 & 1 & 0 & 0 \\ 63 & 7 & 1 & 0 \\ - 9 & - 7 & - 1 & 1 \end{array} \right]$

C) $\left[ \begin{array} { c c c c } 1 & 9 & 63 & - 63 \\ 0 & 1 & 7 & - 7 \\ 0 & 0 & 1 & - 1 \\ 0 & 0 & 0 & 1 \end{array} \right]$

D) $\left[ \begin{array} { r r r r } 1 & - 1 & 7 & - 63 \\ 0 & 1 & 7 & - 63 \\ 0 & 0 & 1 & 9 \\ 0 & 0 & 0 & 1 \end{array} \right]$