If the foot of the perpendicular from the origin to a plane in \( (...

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If the foot of the perpendicular from the origin to a plane in \( (a, b, c) \), the equation of the plane is
(a) \( \frac{x}{a}+\frac{y}{b}+\frac{z}{c}=1 \)
(b) \( a x+b y+c z=3 \)
(c) \( a x+b y+c z=a^{2}+b^{2}+c^{2} \)
(d) \( a x+b y+c z=a+b+c \)
\( \mathrm{P} \)
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