Answer:
full-session DRL
Step-by-step explanation:
In Full-session Differential Reinforcement of Low Rates of responding (DRL), the implementer delivers a reinforcer as long as the behavior occurs less often that the number of times that was specified in the course of the entire session. From the question, the parents are trying to reduce her number of phone calls in a day and hence if she makes fewer calls than the specified number, then her friends are allowed to visit the next day.