Multi-choice problem: Continue writing the next sentence in this paragraph:

How to fillet salmon 
Rinse the salmon in cold running water. 
Make sure the fish is completely washed on all sides. 
Open the belly.

Options: (I) Place the fish on its side on a large cutting board. Hold the tail down with one hand, and with the other insert a fillet knife into the vent, or the anus, located on the underside of the fish near the tail.. (II) Take out the tail, but do not lift it out of the water. Place the fish on a cutting board.. (III) Remove the inner layers of the thickest part of the salmon, using a slotted spoon to pop the belly out of the bones. Then peel and core the fillets on a plastic grocery bag.. (IV) Use a sharp knife to scrape off the hard outer skin. As you peel the tough outer skin, grind it and remove any tough with a finer food processor, blender, or knife..
(I)