Which type of sampling method is being employed in the following example: "A survey is being conducted about student's perceptions of Phoenix High School. So, an office administrator creates a numbered list of all students in the school on an Excel spreadsheet and has the Excel spreadsheet randomly sort the students. Finally, she selects the top 50 students in the randomly sorted list to be surveyed." Simple Random Sampling Sampling of Convenience Stratified Sampling Systematic Sampling Cluster Sampling