Which of the Following Is Important to Keep Secret for Your

Which of the following is important to keep secret for your observation or ethnographic research?

A) the identity of your gatekeeper
B) the real goal of your research, so you don't affect your participants' behavior
C) your real identity, so that you can present yourself as "one of them" to build rapport more easily
D) the location of your observations, in order to protect your participants' identities