If the foot of the perpendicular from the origin to a plane is P (a, b, c),the equation of the plane is

• A

  $\frac{\mathrm{x}}{\mathrm{a}}+\frac{\mathrm{y}}{\mathrm{b}}+\frac{\mathrm{z}}{\mathrm{c}}=3$

• B

  $\mathrm{ax}+\mathrm{by}+\mathrm{cz}=3$

• C

  $\mathrm{ax}+\mathrm{by}+\mathrm{cz}={\mathrm{a}}^2+{\mathrm{b}}^2+{\mathrm{c}}^2$

• D

  $\mathrm{ax}+\mathrm{by}+\mathrm{cz}=\mathrm{a}+\mathrm{b}+\mathrm{c}$