For the system S of linear equations x + y + z = 3, 2x + 2y - z = 3, x + y + λz = 1 the incorrect option among the following statements is
1
S has infinitely many solutions, if λ = -1
2
S has no solution if λ = -2
3
S has no unique solution for any real λ
4
S is consistent for all λ ∈ R