Consider the augmented matrix (12∣400∣0)\begin{pmatrix} 1 & 2 & | & 4 \\ 0 & 0 & | & 0 \end{pmatrix}(1020∣∣40). Which statement describes the solution?
No solution.
Unique solution (0,0)(0,0)(0,0).
Infinitely many solutions.
Unique solution (4,0)(4,0)(4,0).