Study participants trust researchers with their personal health information (PHI), as such researchers use various practices to ensure participant confidentiality, such as:
A. Disposing properly of all documentation with PHI identifiers.
B. Maintaining a notebook of all participant addresses and names in the researcher's personal papers.
C. Storing participant paper records in a locked cabinet.
D. Assigning security codes to electronic records.
E. A, C, and D.