Please help me... Choose which sampling was used. *A researcher divides a group of students according to gender, major field, and low, average, and high-grade point average. Then she randomly selects six students from each group to answer questions in a survey. *Every 10th bottle of Super-Duper Cola is selected, and the amount of liquid in the bottle is measured. The purpose is to see if the machines that fill the bottles are working properly.   Choices:  a. Stratified b. Random c. Systematic d. Cluster

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