A 29-year-old G1P0 at 10 weeks' gestation asks about screening for Down syndrome. According to Canadian prenatal screening practice, which is an appropriate first-trimester screening option?ASecond-trimester maternal serum alpha-fetoprotein aloneBNuchal translucency ultrasound plus first-trimester maternal serum markersCAmniocentesis at 10 weeks' gestationDNo screening is available in the first trimesterERoutine morphology ultrasound at 20 weeks without biochemical testsCheck my answer