Which of the following is the recommended maintenance for a laser printer？ （）

• A、Clean all fan filters； wipe down the paper path and re-adjust the corona wire.
• B、Clean all pickup rollers； re-adjust the corona wire and replace the fuser assembly.
• C、Clean all pickup rollers； replace the fuser assembly and clean all fan filters.
• D、Clean all pickup rollers； wipe down the paper path and clean all fan filters.