When exposing a blood sample to anti-sera, agglutination will occur if the anti-sera contains the same antibodies that would be found in the plasma of the sample being tested. the anti-sera contains antibodies that will bind to the antigens on the red blood cells of the sample being tested. the anti-sera contains the antigen types not found on the red blood cells of the sample being tested. the anti-sera contains the same antigens as found on the red blood cells of the sample being tested.