Certain Guidelines Should Be Kept in Mind When Coding

Certain guidelines should be kept in mind when coding.Among these is(are) the following:

A) the coding scheme should be appropriate to the analysis intended in the study.
B) the coding scheme should be appropriate to the theoretical concepts being examined.
C) the reliability of the coder(s) should always be verified.
D) code categories should be both mutually exclusive and exhaustive.
E) all of these choices are correct.