Identify the Role(s) of Natural Killer Cells

Identify the role(s) of natural killer cells.

A) Phagocytosis of virus infected cells AND production of cytokines that help regulate and direct certain immune responses.
B) Antibody-dependent cellular cytotoxicity AND negative selection of lymphocytes that recognize normal "self" molecules AND regulation and direction of certain immune responses.
C) Destruction of stressed host cells such as those infected with viruses AND negative selection of lymphocytes that fail to recognize normal "self" molecules.
D) Antibody-dependent cellular cytotoxicity OR destruction of stressed host cells such as those infected with viruses.
E) Regulation and direction of certain immune responses AND phagocytosis of virus infected cells AND stimulation of MHC class I molecules.