Definition: 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'.
Input: Question: What is the sampling model whose principle is to directly access the natural agglomerations of units in the population? (workers in factories, students in universities ...): 
 Options:  <1> Stratified sampling. <2> Simple random sampling. <3> Conglomerate sampling. <4> Systematic sampling. <5> Sampling in time.
