Let S be the set of all $\lambda\in R$ for which the system of linear equations

2x – y + 2z = 2

x – 2y + λz = –4

x + λy + z = 4

has no solution. then the set S

(1) is a singleton

(2) contains exactly two elements

(3) contains more than two elements

(4) is an empty set

2x – y + 2z = 2

x – 2y + λz = –4

x + λy + z = 4

has no solution. then the set S

(1) is a singleton

(2) contains exactly two elements

(3) contains more than two elements

(4) is an empty set