If the system of equations $x - ky - z = 0$, $kx - y - z = 0$ and $x + y - z = 0$ has a non zero solution, then the possible value of k are
If the system of equations $x - ky - z = 0$, $kx - y - z = 0$ and $x + y - z = 0$ has a non zero solution, then the possible value of k are
- [IIT 2000]
- A
$-1, 2$
- B
$1, 2$
- C
$0, 1$
- D
$-1, 1$
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- [JEE MAIN 2019]