Graph 2 for use with Questions 12 through 24 only: For this study, stimulus-stimulus pairing was implemented to increase the rate of independent vocalizations in children with ASD. There were three different schedules in which the pairing trials were implemented (e.g., 5 s, 15 s, and 30 s). Data were collected on the rate of vocalizations targeted for each schedule. Graph 2.jpg Flag question: Question 12 Question 120.4 pts Identify the IV and DV. Group of answer choices IV: implementing three schedules of SSP; DV: implementing three schedules of SSP IV: implementing three schedules of SSP; DV: rate of vocalization IV: rate of vocalization; DV: rate of vocalization IV: rate of vocalization; DV: implementing three schedules of SSP