In a typical medium speed, 4-stroke cycle diesel engine ___________________?

A. fuel injection starts at top dead center and ends at 20 after top dead center

B. none of the above

C. fuel injection starts at just before top dead center and ends just after top deac center

D. fuelinjection starts at 10 before to dead center and ends at 20 after tor dead center

E. may start and end anywhere

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