The Following Information Was Found in a Codebook About Social

The following information was found in a codebook about social work students:
COLUMNS DESCRIPTION
1 Enrollment status
1 = Full-time
2 = Part-time
3 = Other
4 Gender
1 = male
2 = female
5 Concentration
1 = Direct practice
2 = Clinical
3 = Micro
4 = Macro
5 = Communities
6 = Administration
7 = Child welfare
8 = Mental health
Which of the following statements is true concerning the codebook?

A) The variables in this codebook are male, female, and concentration.
B) Gender has been coded so that the categories are mutually exclusive and exhaustive.
C) Concentration has been coded so that the categories are mutually exclusive and exhaustive.
D) None of these statements is true.