An in-depth interview:

A.involves an extended contact with a natural setting, but without participation by a researcher.
B.involves asking a respondent a set of semistructured, probing questions in a face-to-face setting.
C.has a high likelihood of participants responding in a socially desirable manner.
D.is a formalized process of bringing a small group together for discussion on a particular topic.
E.is also called memoing