An operant condition where paradigm pain stimulus is given to a child for decreasing a certain undesired behaviour can be classified as -

Reinforcement Positive reinforcement:- A reward is given on the performance of the desired behavior. Negative reinforcement:- On the performance of the desirable behavior, punishment is avoided. Punishment:- On performing an undesired behavior, an aversive stimulus (paradigm pain in this question) is given. Note-The basic difference between reinforcement and punishment is that reinforcement (Positive or negative) is to promote desired behavior, on the other hand, punishment is to decrease undesired behavior.