A company would like to dispose of old toner units. Which of the following would be the MOST appropriate course of action to take？（）

1. A Use an approved recycling program either through a vendor or local government agency. 正确答案
2. B Old toner disposal is the responsibility of the manufacturer. Call the appropriate number at the respective company.
3. C Toss the units into the trash. Toner cartridges are biodegradable.
4. D Clean out the toner cartridges with warm water and place the clean units into the recycling collection.