A 29-year-old woman delivers vaginally after an uncomplicated labour. Within 30 minutes she develops heavy vaginal bleeding, estimated at 1000 mL, with a soft boggy uterus on palpation. What is the most appropriate immediate management step?AAdminister uterine massage and oxytocinBOrder CT angiographyCStart broad-spectrum antibiotics onlyDInsert an intrauterine balloon tamponade as first-lineEObserve as this is normal postpartum lochiaCheck my answer