Tommy Is Frequently Asking His Parents Questions,and They Want to Decrease

Multiple Choice

Tommy is frequently asking his parents questions,and they want to decrease his behavior to an acceptable level.Tommy's parents tell him that they will answer a question only if it has been at least 10 minutes since his last question.If Tommy asks a question before the 10-minute interval is up,his parents do not reinforce his behavior with an answer to the question? Which DRL variation are Tommy's parents using?​

A) ​full-session DRL
B) interval DRL​
C) ​spaced-responding DRL
D) ​secondary DRL