I have figured out every one but 4th down. Help!

Student Government at CCD wants to conduct a survey of student opinions. Match the sampling scenario with the appropriate sampling technique. Number the seats at the 2 V cafeteria, then use a random number to interview students in those seats until 60 students have been surveyed. 1 V Survey the first 60 students to arrive on campus one morning. 1. Convenience Sampling 3 V Use a random numbers to 2. Systematic Sampling select 30 first year students and 30 second year students. 3. Stratified Sampling Number the students enrolled in the college, and use a table of random numbers to choose 4. Simple Random Sampling 60 students from this list to survey. 2 V Survey every 10th student to enter the library until 60 students are surveyed