This is a question with answer options. What kind of thing would the answer to the question "Who was the bandleader mentor of Ella Fitzgerald with whom she cowrote `` A_Tisket , A-Tasket '' ?" be an entity, an abbreviation, a description, a human, a location, or a numeric value?

OPT:
 a). description.
 b). entity.
 c). abbreviation.
 d). human.
 e). numeric.
 f). location.
d).