Detailed Instructions: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Problem:Question: What simple reinforcement programs produce a more stable response pattern ?:
Options: <1> Those of fixed ratio. <2> Those of variable reason. <3> Those of fixed interval. <4> Those of variable interval. <5> All reinforcement programs produce similar response rates.
Solution:
2