Final answer:
The drug RhoGAM, used to prevent the development of Rh antibodies in Rh mothers, can be administered by a registered nurse.
Step-by-step explanation:
The drug RhoGAM is an Rh immune globulin which is administered to Rh mothers during weeks 26-28 of pregnancy and within 72 hours following birth to prevent the development of Rh antibodies that can harm the fetus. Based on the information provided, the correct answer to your question is: a) Registered nurse.