When Testing for Antiviral IgM Antibody, False-Negative Results May Occur

When testing for antiviral IgM antibody, false-negative results may occur when

A) rheumatoid factor combines with homologous or virus-specific IgG present in the patient specimen.
B) high levels of strongly binding homologous IgG antibodies prevent binding of IgM molecules.
C) antibody-Fc receptors occur in cells infected with virus.
D) All of the above are correct.