Question: when designed experiments are conducted in a public school systems, researchers typically choose a particular district, and randomly select teachers of say fourth grade students

when designed experiments are conducted in a public school systems, researchers typically choose a particular district, and randomly select teachers of say fourth grade students in the district. The experiment is then conducted using all the students in the selected classes. which type of sampling scheme is implemented?

sample random sample
a voluntary response sample
a systematic ramdom sample
a stratified random sample
a cluster sample

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