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A 37-year-old gravida 3, para 2 woman at 35 weeks gestation presents with vaginal bleeding which began after sexual intercourse. She has had inconsistent prenatal care during this pregnancy. She reports no contractions, pelvic pain, or abdominal pain, and she has continued to feel good fetal movement. Both the woman's vital signs and initial fetal heart rate monitoring are normal. Of the following choices, which is the most likely diagnosis?