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Design of both summit and valley curves is based on the assumption that the

[A].	curve is so flat that the length of curve is equal to the length of chord	[B].	two portions of the curve along the two tangents on either side of the point of intersection are equal
[C].	angles made by the tangent with the horizontal are very small and tangents of those angles are equal to the angles themselves (in radians)	[D].	all of the above

Answer: Option D