Joan begs her father for a frosted cookie at the bakery but he refuses to buy her one. joan continues to whine and complain until finally he breaks down and gets her the cookie. for her dad, the cessation of joan's whiny behavior is a _______________, and, for joan, the cookie is a _______________.
a. positive reinforcer; positive reinforcer
b. negative reinforcer; positive reinforcer
c. negative reinforcer; negative reinforcer
d. positive reinforcer; negative reinforcer