What Is the General Rule About Collecting Demographic Data During

What is the general rule about collecting demographic data during an interview?

A) The mood of the qualitative interview, so crucial to quality data capture, may be intruded upon by demographic data collection.
B) In quantitative interviews, everything excerpted from medical records must again be verified in face interviews.
C) In qualitative interviews, routinely asking 20 or 30 demographic questions sets the stage for actual data collection.
D) If data can be obtained in other ways, it is best to leave the valuable interview time for actual interviewing.