Consider the augmented matrix [A∣b]=(11∣211∣3)[A|b] = \begin{pmatrix} 1 & 1 & | & 2 \\ 1 & 1 & | & 3 \end{pmatrix}[A∣b]=(1111∣∣23). Which statement describes the system?
It has a unique solution.
It has infinitely many solutions.
It is inconsistent.
The matrix is in RREF.