Rh-Negative Mothers Who Are in Their Second or Subsequent Pregnancy

Rh-negative mothers who are in their second or subsequent pregnancy will often receive this treatment to prevent hemolytic disease of the newborn?

A) An Rh immune globulin, or antiserum directed against Rh-positive antibodies, is administered during pregnancy and within 72 hours of delivery.
B) An Rh immune globulin, or antiserum directed against Rh-negative antibodies, is administered during pregnancy and within 72 hours of delivery.
C) A series of graded injections of Rh-positive antigen is administered during pregnancy to switch anti-Rh IgG (which crosses the placenta) to anti-Rh IgM (which cannot cross the placenta) .
D) A series of graded injections of Rh-negative antigen is administered during pregnancy to switch anti-Rh IgG (which crosses the placenta) to anti-Rh IgM (which cannot cross the placenta) .