At 6-weeks gestation, the rubella titer of a client indicates she is nonimmune. When is the best time to administer a rubella vaccine to this client?

Rationale: A. Immediately, at 6-weeks gestation: Rubella vaccine is a live attenuated vaccine and is contraindicated during pregnancy because it can potentially cause fetal harm. B. After the client reaches 20-weeks gestation: Administering rubella during pregnancy at any gestational age is unsafe due to the live virus, so waiting until mid-pregnancy does not prevent fetal risk. C. After the client stops breastfeeding: Rubella vaccination can be given while not pregnant, including postpartum, and is not strictly contraindicated by breastfeeding. Timing postpartum is more critical than waiting until breastfeeding ends. D. Early postpartum, within 72 hours of delivery: The optimal time to vaccinate a nonimmune mother is immediately after delivery, ideally within 72 hours, to provide immunity for future pregnancies and prevent congenital rubella syndrome in subsequent pregnancies.