To teach a tiger to jump through a flaming hoop, the tiger is first reinforced for jumping up on a certain pedestal, then for leaping from that pedestal to another. Next, the tiger has to jump through a hoop between the pedestals to get the reward. Finally, the hoop is set afire and the tiger must jump through it to get the reward. This is an example of .
a. modeling b. shaping
c. negative reinforcement
d. secondary learning