Q: 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'.
Question: Adaptive tests are characterized by:
Options: <1> The unidirectional relationship between the evaluated and the test. <2> The interactive process of selection of items dependent on the response of the evaluated. <3> The homogeneous and identical application of the items to all those evaluated. <4> The identical length in the number of items to be applied. <5> The selection of items by independent criteria to the response of the evaluated.
A:
2