Pinnacle High School needs to choose five students to represent the school at a conference. The principal writes the students' names on slips of paper, mixes the papers up, and then randomly chooses five. This is an example of which of the following sampling techniques?
A. Systematic
B. Cluster
C. Convenience
D. Simple random sample
E. Stratified random
A. Systematic
B. Cluster
C. Convenience
D. Simple random sample
E. Stratified random