A newborn child is being evaluated by echo- cardiography for a suspected congenital heart defect. During the procedure the technologist identifies flow from one atrium into the other and flow from one ventricle into the other, in both cases, at separate sites. Of the following forms of congenital heart dis- ease, which is the infant most likely to have?

a) Tetralogy of Fallot

b) Totally anomalous pulmonary venous return

c) Transposition of the great arteries

d) Tricuspid atresia

e) Persistent truncus arteriosus