In a secondary school, there are 5 classes of grade 9 academic mathematics. The classes are labelled A, B, C, D, and E. Each class has 30 students. In each class, the students are numbered from 1 to 30. The label A06 indicates the sixth student in class A. A random sample of 10 students enrolled in grade 9 academic mathematics at this school results in the following students being selected: A09, B13, B15, B24, D11, D12, E02, Which type of sampling technique method might have been used and why? E13, E18

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