Problem: Which of the following best describes a cross-sectional study on children's development?
Multiple Choices:
- The performance of children who performed well in a test given to them when they were 5 years old is measured continuously until adulthood.
- The same children are tested at 1, 3, 5, and 9 years of age.
- Children who are 1, 3, and 5 years of age are tested again when they are 3, 5, and 7, respectively.
- Children who are 2, 6, and 8 years old are tested simultaneously.