The Researcher Provides a Prepaid Postcard with an Individualized Code

The researcher provides a prepaid postcard with an individualized code on it, along with a copy of the questionnaire that contains no code, to each respondent, and requests that they be returned separately. This procedure

A) enables the researcher to match each questionnaire with the correct respondent.
B) enables the researcher to provide complete anonymity to respondents.
C) makes it impossible to follow up with nonrespondents to increase the rate of response.
D) is recommended for any questionnaire to be mailed to a sample that is widely distributed geographically.