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Berry Good LLC registers its trademark with the U$.$S$.$ Patent and Trademark Office and uses it to market a distinctive line of ice cream products. Crabapple Inc. uses the mark without Berry's consent to sell imitation frozen desserts. Berry has a cause of action against:

a$.$ Crabapple.

b$.$ the U$.$S$.$ Patent and Trademark Office.

c$.$ consumers who buy Crabapple's desserts.

d$.$ no one.