Two strategies related to the positive reinforcement function are especially effective together: 1) extinction of challenging behavior, and 2) reinforcement of specific types of appropriate replacement behavior. The second strategy involves identifying the appropriate behavior that will replace the challenging behavior and providing reinforcement contingent on the occurrence of that replacement behavior. Which term is used to describe the second strategy?a. discriminative reinforcement.b. differential reinforcement.c. nondifferentiated reinforcement.d. noncontingent reinforcement.