What steps must be taken when replacing a timing belt on an interference engine to prevent piston-to-valve contact?

• A. Set engine to top-dead-center on correct cylinder marks; align timing marks on pulley and gear; replace tensioner and idlers; install belt with proper direction; rotate crank by hand two full turns to verify marks align; re-check timing after installation
• B. Set engine to random position and install belt
• C. Rotate crank while belt is off and start engine to check timing
• D. Replace belt and hope for best

Answer: (A)