On a Short Axis View, the Umbilical Cord Presents as

On a short axis view, the umbilical cord presents as

A) a single large, round, anechoic vessel flanked by two small, round, anechoic vessels encircled by thick, bright walls.
B) a single small, round, anechoic vessel interposed between two large, round, hypoechoic vessels.
C) two linear, anechoic vessels with bright walls that join the fetal portal vein and a single linear, anechoic vessel with hyperechoic walls that joins the urinary bladder.
D) a single large, anechoic vessel flanked by two linear, anechoic vessels.