This is a question with answer options. What kind of thing would the answer to the question "What is the difference between optical and digital video ?" be an entity, an abbreviation, a description, a human, a location, or a numeric value?

pick from the following.
 (a). description.
 (b). entity.
 (c). abbreviation.
 (d). human.
 (e). numeric.
 (f). location.
(a).