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According to the law of gearing

[A].	Common normal at the point of contact always passes through a fixed point (pitch point) on the line joining the centres of rotation	[B].	Teeth should be involute type
[C].	Teeth should be cycloidal type	[D].	Clearance should be minimum 0.15 mm
[E].	The gears whould be cut with the cutter having same module

Answer: Option A