Which of the Following Statements Are True of Foreign Antigens

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

A) An antigen will be recognized as foreign if it is different from our "self" antigens.
B) Bacteria and viruses are foreign antigens but a person's own cancer cells are not considered foreign.
C) Innate immunity does not have memory for foreign antigens,but adaptive immunity does have memory.
D) Innate immunity stimulates antibody production only against viruses.
E) Adaptive immunity becomes more efficient with repeated exposures to an antigen but innate immunity does not.
F) The responses of innate immunity are always the same but the adaptive immune response is different for each pathogen.