_ In a typical medium speed 4-stroke cycle diesel engine the inlet valve$?

• A. Opens at 20¬¨‚àû before top dead center and closes at 35¬¨‚àû after the bottom dead center
• B. Opens at top dead center and closes at bottom dead center
• C. Opens at 10¬¨‚àû after top dead center and closes 20¬¨‚àû before the bottom dead center
• D. May open or close anywhere