Which of the Following Statements Correctly Compares and Contrasts A-Priori

Multiple Choice

Which of the following statements correctly compares and contrasts a-priori and a-posteriori methods of reference individual selection?
1) In both methods, exclusion and partitioning take place after sampling and analyte testing.
2) A-priori methods require fewer reference individuals to be studied than a-posteriori methods.
3) Questionnaires for potential reference individuals must be more detailed for a-posteriori methods than for a-priori methods.

A) 1, 2, 3
B) 1, 2
C) 2, 3
D) 1, 3