The administration of a large university is interested In learning about the wellness programs that would Interest Its employees. To do this, they plan to survey a random sample of employees. Randomly select a school within the university (e.g, Business School) and survey all of the individuals (administration, faculty, professional staff, clerical, and maintenance) who work in that school. What type of sampling strategy is this? O Systematic Sampling Stratified Sampling Convenience Sampling Simple Random Sampling Cluster Sampling