You are answering a USMLE-style medical question. Question: A 23-year-old woman, gravida 2, para 1, at 20 weeks of gestation comes to the physician for a routine prenatal exam. Her last pregnancy was unremarkable and she gave birth to a healthy rhesus (RhD) positive girl. Her past medical history is notable for a blood transfusion after a car accident with a complex femur fracture about 3 years ago. Her temperature is 37.2°C (99°F), pulse is 92/min, and blood pressure is 138/82 mm Hg. Examination shows that the uterus is at the umbilicus. Ultrasound examination reveals normal fetal heart rate, movement, and anatomy. Routine prenatal labs show the following: Blood type A Rh- Leukocyte count 11,000/mm3 Hemoglobin 12.5 g/dL Platelet count 345,000/mm3 Serum Anti-D antibody screen Negative Rubella IgM Negative Rubella IgG Negative Varicella IgM Negative Varicella IgG Positive STD panel Negative Urine Protein Trace Culture No growth Cervical cytology Normal Which of the following is the best next step in management of this patient?" Options: A) Repeat antibody screening at 28 weeks. Administer anti-D immunoglobulin at 28 weeks and after delivery if the newborn is Rh(D) positive. B) Repeat antibody screening at 28 weeks and administer anti-D immunoglobulin at 28 weeks. No further management is needed. C) No further screening is needed. Administer anti-D immunoglobulin shortly after delivery D) No further management is needed " Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.