A 28-year-old primigravida at 39 weeks' gestation has a postpartum haemorrhage estimated at 1200 mL after vaginal delivery with uterine atony. According to SOGC postpartum haemorrhage guidance, what is the most appropriate immediate management step?AObserve only, as 1200 mL is within normal postpartum blood lossBAdminister uterotonic agents (e.g., oxytocin), perform uterine massage and activate the obstetric haemorrhage protocolCGive diuretics to reduce intravascular volumeDDelay action until laboratory confirmation of anaemiaETreat only with tranexamic acid without uterotonicsCheck my answer