Final answer:
The Tetanus, diphtheria, and pertussis (Tdap) vaccine is safe and recommended during pregnancy to protect the newborn from pertussis, also known as whooping cough. The Inactivated influenza vaccine is also safe and recommended. The MMR and Varicella vaccines are not recommended during pregnancy due to their live attenuated nature.
Step-by-step explanation:
The safe vaccine to administer to a client who is pregnant, among the options provided, is the Tetanus, diphtheria, and pertussis (Tdap) vaccine. It is recommended during pregnancy to protect the newborn from pertussis, also known as whooping cough. The Measles, Mumps, and Rubella (MMR) vaccine and the Varicella (chickenpox) vaccine are generally not recommended during pregnancy due to their live attenuated nature. The Inactivated influenza vaccine is also considered safe and is recommended for pregnant individuals to protect both the mother and the baby from influenza. Vaccines such as Tdap and the inactivated influenza vaccine are vital during pregnancy because they provide passive immunity to the baby for the first few months of life.