If the distance of the point ( 1,1,1) f...

If the distance of the point ( 1,1,1) from the origin is half its
distance from the plane x+y+z+k=0 , then k is equal to :

A

`+-3`

B

` +-6`

C

` -3,9`

D

`3,-9`

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The correct Answer is:

D

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