Here is a single or multi-choice question: Who wrote The Secret Life of Walter Mitty ?

Would the answer to this question be an entity, an abbreviation, a description, a human, a location, or a numeric value?

OPTIONS:
 (1). description.
 (2). entity.
 (3). abbreviation.
 (4). human.
 (5). numeric.
 (6). location.
(4).