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Which one of the following is a correct statement

[A].	the exhaust valve of a four stoke I.C. engine should open exactly at the end of expansion stroke	[B].	in actual practice, inlet valve of a four stroke I.C. engine should open exactly at the start of suction stroke
[C].	the inlet valve remains open approximately for 180?	[D].	valve overlap is the angle during which both the inlet and exhaust valves remain open simultaneously

Answer: Option D