Which of the Following Statements Is True of Cognitive Interviewing

Which of the following statements is true of cognitive interviewing and field pretesting?

A) Cognitive interviewing is one of several field pretesting techniques.
B) Both methods are likely to use unrepresentative samples of paid subjects.
C) Both methods focus exclusively on the respondent's perspective on the interviewing process.
D) Field pretesting generally precedes cognitive interviewing.
E) They use complementary techniques with different strengths and weaknesses.