If the system of equations x-ky-z=0 , ...

If the system of equations x-ky-z=0 , kx-y-z=0 , x+y-z=0 has a non-zero solution , then possible values of k are :

A

`-1,2`

B

`1,2`

C

`0,1`

D

`-1,1`

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The correct Answer is:

D

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