A 30-year-old primigravida at 10 weeks' gestation attends her first antenatal visit. She has no risk factors for gestational diabetes. According to Canadian guidance, when should she be screened for gestational diabetes?AAt the first visit using fasting glucose onlyBAt 12 weeks' gestation with HbA1cCBetween 24 and 28 weeks with a 50 g glucose challenge test followed, if abnormal, by an oral glucose tolerance testDNo screening is necessary in low-risk womenEOnly postpartum with a 75 g oral glucose tolerance testCheck my answer