In a typical medium speed 4-stroke cycle diesel engine _______.

(a)    compression starts at 35° after bottom dead center and ends at top dead center
(b)    compression starts at bottom dead center and ends at top dead center
(c)    compression starts at 10° before bottom dead center and, ends just before top dead center
(d)    may start and end anywhere
(e)     none of the above.

Ans: a