Covert Researchers Differ from Overt Researchers in That Covert Researchers

Covert researchers differ from overt researchers in that covert researchers:

A) enter the field by revealing status as a researcher
B) reveal to the participants that they are being studied.
C) stand back a bit,and do not immerse into the lives of their subjects.
D) enter the field as though they are full participants and hide their true identity of being a researcher.
E) do not participate with the research subjects rather they stand back and observe as a field research.