The Two- Signal Activation Process for T Cells Includes

The two- signal activation process for T cells includes

A) interaction of the T- cell receptor with the MHC- antigen complex on the APC AND binding between co- stimulatory proteins on the T cell and APC surfaces.
B) the presence of antibodies AND binding between co- stimulatory proteins on the T cell and APC surfaces.
C) the presence of a superantigen and the presence of appropriate antibodies.
D) interaction of the T- cell receptor with the MHC- antigen complex on the APC AND the presence of a superantigen.
E) the presence of a superantigen AND binding between co- stimulatory proteins on the T cell and APC surfaces.