**Solve using matrices:** \[ \begin{align*} 6x - y - 8z &= 5 \\ 2x + y - z &= 5 \\ 8x + y - 7z &= 9 \\ \end{align*} \] Select the correct choice below and, if necessary, fill in the answer boxes to complete your choice. **A.** This system has exactly one solution. The solution is \((\_, \_, \_)\) *(Type an exact answer in simplified form.)* **B.** This system has infinitely many solutions of the form \((\_, \_, z)\), where \(z\) is any real number. *(Type expressions using \(z\) as the variable.)* **C.** This system has no solution.

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