business law questions

American Clothing Company and National Denim Corporation use the mark "Made by Members of the U.S. Textile Workers Union" on the tags of their products to indicate the participation of this union in the manufacture of those products. American and National are not in business together and do not own this mark. The mark is a service mark. a certification mark. trade dress a collective mark. In 2002, Tom writes The Internet Murders, a mystery novel. Tom does not register the work with the appropriate government office. Under federal copyright law, Tom's work is protected for twenty years for the life of the author plus seventy years. for ten years. forever