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The matrix below is the reduced row echelon form of the augmented matrix representing a linear system. Which one of the following must be true about the system?

$$\left [\matrix { 1 & 0 & 2 & 3\cr 0 & 1 & 0 & 5 \cr 0 & 0 & 0 & 6} \right ]$$


The system has infinitely many solutions.


The system has more than one, but finitely many solutions.


The system has exactly one solution.


The system has no solutions.


There is not enough information given to determine whether or not any of the above statements are true.

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