After the Baby Is Delivered, It Is Safe to Cut

After the baby is delivered, it is safe to cut the umbilical cord because

A) the infant will soon receive nourishment from the mother's breast milk.
B) the infant's heart has begun to beat on its own.
C) the infant will start to urinate when it needs to eliminate wastes.
D) the umbilical cord is no longer attached to the placenta.
E) once the infant begins to breathe, it no longer is dependent on its mother for oxygen.