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'.
Q: Question: At what stage of problem-solving therapy are the principles of quantity, deferment of judgment and variety used?
Options: <1> Decision making. <2> Orientation towards the problem. <3> Definition and formulation of the problem. <4> Generation of alternative solutions. <5> Implementation and verification of the solution.
A:
4