A nurse is reinforcing teaching about immunizations to a client who is pregnant. Which of the following immunizations should the nurse identity as contraindicated during pregnancy?

A. Measles, mumps, and rubella: The MMR vaccine is a live attenuated vaccine, which is contraindicated during pregnancy due to the risk of fetal infection and teratogenic effects. Pregnant clients should receive this vaccine only after delivery if they are not immune. B. Hepatitis B: The hepatitis B vaccine is an inactivated vaccine and is considered safe during pregnancy, particularly for clients at increased risk of infection. C. Influenza: The inactivated influenza vaccine is safe during any trimester of pregnancy and helps protect both the mother and infant from influenza-related complications. D. Diphtheria, tetanus, and pertussis: The Tdap vaccine is recommended during pregnancy, ideally between 27 and 36 weeks gestation, to confer passive immunity to the newborn.