An ad for Tums antacid shows a guest at a restaurant asking for Tums to alleviate his heartburn. The waitress brings him a bowl that is filled with packets of Maalox, Rolaids, Tums and other antacids. The waitress says that all antacids are the same. The guest then explains to her that Tums is different because it is the only antacid brand that has calcium. Tums is using: Group of answer choices one-sided advertising two-sided advertising comparative advertising verbal appeals visual appeals'