In the Context of Prenatal Assessment Techniques, a Similarity Between

In the context of prenatal assessment techniques, a similarity between amniocentesis and ultrasound is that both

A) can be used for sex screening of unborn babies.
B) offer direct access to fetal DNA for diagnostic measures.
C) involve the most risk among all prenatal diagnostic procedures.
D) can guide fetal blood transfusions and bone marrow transplants.