Q 1217012889.     `P` is a point on the plane `ax + by + cz = d`.

A point `Q` is taken on the line `OP` such that `OP . OQ = d^2`.

If the locus of `Q` satisfies `(d(ax+by+cz))/(x^2+y^2+z^2)=k` then k will be

A

`4`

B

`7`

C

`1`

D

`6`

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