Which of the following describes an inconsistent linear system?
The row echelon form contains a row [0,0,…,0∣k][0, 0, \dots, 0 | k][0,0,…,0∣k] where k≠0k \neq 0k=0
The matrix has more columns than rows
The rank of the matrix is equal to the number of variables
The system has exactly one solution