How can a "researcher acting as an instrument" in a qualitative study best ensure the trustworthiness of the data analysis and the conclusions?

Command is: a. the ability to control information exchange within and across organizations involved in an incident. b. assumed by the individual who is the highest-ranking person on the scene regardless of experience or training level. c. based on the number of individuals or resources that one supervisor can manage effectively during an incident. d. directing, ordering, or controlling by virtue of explicit statutory, regulatory, or delegated authority.