The serif font is unique because it a. has small lines or characters added to the ends of the characters for embellishment. b. persuades the general public to consume or purchase a product or service. c. uses symbols which are easily recognizable by all people across the world. d. changes the appearance of the layout, while providing the same message.

a. has small lines or characters added to the ends of the characters for embellishment.

In typography, a serif is a little line joined to the finish of a stroke in a letter or image. A typeface with serifs is known as a serif typeface. A typeface without serifs is called sans-serif or sans-serif, from the French sans, signifying "without".

c. the branch of philosophy that deals with beauty and how it is expressed and appreciated