Q 1267701685.     A plane passes through a fixed point `(a, b, c)` . Locus of the foot of the perpendicular to it from the origin is a sphere of radius:

A

`1/2sqrt (a^2+b^2+c^2)`

B

`1/3sqrt (a^2+b^2+c^2)`

C

`a^2+b^2+c^2`

D

`sqrt(a^2+b^2+c^2)`

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