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The eccentricity of a parabola is

  • A.less than one but greater than zero
  • B.greater than one
  • C.zero by definition of the curve
  • D.exactly one

Answer: D

Every point is equidistant from focus and directrix, which is the defining property and the reason the curve neither closes on itself nor divides into branches. It marks the exact boundary between the ellipse and the hyperbola.

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