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In vibration analysis 'Beat' frequency is

[A].	The frequency at which vibrations of a system are damped	[B].	The frequency when a system exceeds the vibrations frequency from the critical value
[C].	The frequency below which vibrations do not cause appreciable damage to equipment	[D].	Said to occur when two vibrations of almost equal frequency are present
[E].	One at which the vibrations of a system act exactly opposite to the other thereby causing damping

Answer: Option D