Suppose the leadership team wanted representation in their sample from the following four parts of the country: South, North, Midwest, and West. Thus, they decided to use a different sampling method. They found which part of the country each of their members were from and divided their members into groups based on their part of the country. Then they took a simple random sample of size 100 from each group representing the different parts of the country. What is the name of this sampling method? A. Voluntary Response B. Convenience C. Cluster D. Systematic E. Stratified Random