The row-echelon form of the augmented matrix of a system of equations is given. Find the solution of the system.

1 0 - 1 - 3

0 1 5 - 4

0 0 1 1

A. x = - 3

y = - 9

z = 1

B. x = 2

y = - 9

z = 1

C. x = - 2

y = - 9

z = 1

D. x = 3

y = - 9

z = 1

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