The correct answer is D) all of the above. The federal regulations regarding the discharge of sewage from vessels require that the sewage be either pumped ashore to an approved container, held in an onboard holding tank, or treated in an approved sewage treatment system before discharge. All three of these methods are in compliance with the regulations, as they prevent the direct discharge of untreated sewage into the water. The other options are incorrect because they do not encompass all the approved methods for managing sewage discharge. Holding sewage onboard or treating it in an approved system are both valid methods, but they do not cover the option of pumping ashore, which is also an approved way to comply with the regulations.