Maggie works at a large hospital. She is in charge of patients' medical records. She ensures that the records are complete and protected from being accessed by unauthorized persons. What is Maggie's main job duty? What role does Maggie play in the hospital?

a. Maggie's main duty is maintaining the security and privacy of medical records.
b. Maggie is a nurse.
c. Maggie handles billing and insurance claims.
d. Maggie is a receptionist.