2. Why helper T cells play a central role in the immune response?
(A) Helper T cells are the only immune cell type that canproduce immunological memory
(B) Helper T cells can be activated through innate immuneresponse by antigen-presenting cells such as macrophagesand dentritic cells, setting stage for the adaptive immuneresponse
(C) Activated helper T cells release perforin that make pores inthe target cell's membrane and enzymes promotingapoptosis leading to cell death
(D) Activated helper 'T cells can produce antibodies