A new ocean going ship of 2000 gross tons having an inoperative oily water separator may dispose of its bilge slops by （）.

A. holding its slops onboard until they can be pumped into the city sewer system
B. circulating them through the lube oil purifier to remove water and debris
C. holding its slops onboard until they can be discharged to a shore side reception facility
D. pumping them into a settling tank for separation before pumping the oily water residue overboard