Which of the Following Is the Proper Way to Maintain

Which of the following is the proper way to maintain confidentiality in qualitative work?

A) Use pseudonyms for participants, but use the actual names of places and locations.
B) Use pseudonyms for participants, and change the names of places, locations, and other identifying characteristics.
C) Use the actual names of participants, but change the names of places and locations.
D) Use the actual names of participants, and the actual names of places and locations.