The row-echelon form of the augmented matrix of a system of equations is given. Find the solution of the system. 1 0 4 -1
0 1 -1 3
0 0 1 1

A. x=-6
y=4
z=1

B. X=5
Y=4
Z=1

C. X=-5
Y=4
Z=1

D. X=6
Y=4
Z=1

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