A community health nurse is caring for a client who was exposed to the human immunodeficiency virus (HIV) 2 days ago. The client asks the nurse what she should do. Which response should the nurse make?

"I will administer an HIV test today, and you will need to return in 48 hours for me to read the results."

"You will need to take prophylactic medications for 4 weeks."

"I will administer an HIV vaccine today, and it will need to be repeated in 3 months."

"You will need to have an HIV test every other week for 6 months."