Which of the following describes "multistage sampling"?

Multistage sampling is characterized by its use of different sampling techniques at various stages of the selection process. This approach can enhance efficiency and reduce costs while still aiming to maintain representativeness in the sample. For example, a researcher might first use cluster sampling to select groups or clusters from a population, and then apply stratified sampling within those clusters to ensure that different subgroups are adequately represented. This flexibility allows researchers to tailor their sampling methods to the specific research context and objectives, making it a valuable method in survey research and other fields.