Cross-Priming of the Immune Response Occurs When _____

Cross-priming of the immune response occurs when _____.(Select all that apply.)

A) viral antigens are presented by MHC class I molecules on the surface of a cell that is not actually infected by that particular virus
B) cytosol-derived peptides enter the endoplasmic reticulum and bind to MHC class II molecules
C) phagolysosome-derived peptides bind to MHC class II molecules
D) peptides of nuclear or cytosolic proteins are presented by MHC class II molecules.