You wish to determine the GPA of students at your school. Select the correct sequence of process steps you would go through to collect a sample if you use a stratified sample:

1. Obtain a list of all students at the school from the registrar's office.
2. Separate the students into different groups by major.
3. Use a random number generator to randomly choose the students you want to have in your sample from each major and record their GPA
4. Assign each student a number
5. Use a random number generator to randomly choose certain majors and then record the GPA from all students in the chosen majors.
6. Divide the students based on their major.
7. Randomly choose a number as the starting point, then count from the beginning of the list to the starting point. Then choose every 50th student from this starting point and record their GPA.

A.) 1-4-6-5

B.) 1-7

C.) 1-4-2-3

D.) 1-3-4-2