Which Is True About Superantigens

Which is true about superantigens?

A) They are a type of exotoxin AND they stimulate an abnormally high number of TC cells.
B) They bind to MHC class II molecules on T cells AND they are a type of endotoxin.
C) They bind to MHC class II molecules on T cells AND they enhance specific antibody production.
D) They are processed intracellularly AND they are a type of endotoxin.
E) They are a type of exotoxin AND they bind to MHC class II molecules on T cells.