When Teaching a Class of Primigravidas,the Nurse Explains That While

When teaching a class of primigravidas,the nurse explains that while the mother is pregnant,the physician may order a blood test to identify the maternal level of Rh antibodies.This test is called a(n) :

A) indirect Coombs' test.
B) hemolytic test.
C) Rh antibody test.
D) direct Coombs' test.