How does HP recycle cartridges?

A.
Where possible, HP tests every empty ink cartridge that is returned to see if it can be refilled.

B.
HP encourages customers to close the loop and decide if a cartridge should be sent to a landfill
or get refilled.

C.
HP closes the loop and manufactures new laser cartridges by using up to 25% recycled
plastics.

D.
Where possible. HP tests every empty ink cartridge that is returned to sell them to local refillers.

Explanation:
http://www8.hp.com/us/en/hp-news/press-release.html?id=1397452#.UrRbsGQmmZ0