A nurse working in radiology administers iodine to a patient who is having a computed tomography (CT) scan. The nurse working on the oncology unit administers chemotherapy to patients who have cancer. At the Public Health Department, a nurse administers a measles-mumps-rubella (MMR) vaccine to a 14-month-old child as a routine immunization. Which branch of pharmacology best describes the actions of all three nurses?

a) Pharmacoeconomics focuses on the cost-effectiveness of drugs and their impact on healthcare systems, not the administration of drugs for specific treatments. b) Pharmacotherapeutics is the study of how drugs are used to treat, prevent, and diagnose diseases. Since all three nurses are administering medications for diagnostic, therapeutic, and preventive purposes, their actions fall under pharmacotherapeutics. c) Pharmacodynamics refers to the mechanism of action of drugs, including how they interact with receptors and produce physiological effects, but it does not describe drug administration. d) Pharmacokinetics deals with the absorption, distribution, metabolism, and excretion of drugs, but this question is focused on the purpose of drug administration rather than its movement through the body.