Which of the Following Statements Are True of Antibodies? (Read

Which of the following statements are true of antibodies? (Read carefully and select all of the correct statements.)

A) Antibodies destroy antigens by penetrating their cell membranes.
B) The only class of antibodies that can cross the placenta is IgM.
C) The IgA class of antibodies is found on mucous membranes and in breast milk.
D) Antibodies render toxins harmless because they change the shape of the toxins.
E) Antibodies label foreign antigens, and such a label stimulates phagocytosis by macrophages.
F) Antibodies are effective against viruses because they disable the nucleic acid of the virus.