A 31-year-old G2P2 woman has a postpartum haemorrhage of 1200 mL following vaginal delivery due to uterine atony. Uterine massage and oxytocin infusion have been started. According to SOGC guidance, what is the next best pharmacologic step?AAdminister additional oxytocin onlyBAdminister tranexamic acid and a second uterotonic such as carboprost or ergometrineCStart intravenous heparinDAdminister high-dose corticosteroidsEGive misoprostol rectally and discharge homeCheck my answer