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The prime circle of a cam is

[A].	The smallest circle drawn to the pitch curve from the centre of rotation of curve	[B].	The smallest circle drawn to the cam profile from the centre of rotation of a radial cam
[C].	The circle with centre as the centre of cam axis and radius such that it passes through the pitch point	[D].	The circle fitting in cam profile
[E].	None of the above

Answer: Option A