Which of the following is the most prominent difference between brand-name medications and generic medications? a. brand-name medications are easier to purchase because generic medications usually need to be specially ordered. b. brand-name medications have a guarantee of quality and effectiveness from the manufacturer and generic medications don't. c. generic medications contain the same ingredients as brand-name medications, but the ingredients in brand-name medication are of a higher quality. d. brand-name medications contain a trademark and generic medications are referred to by the name given to them based on their chemical makeup.