how do helper t-cells (cd4 ) and cytotoxic t-cells (cd8 ) work together? group of answer choices cytotoxic t-cells produce cytokines to activate helper t-cells. helper t-cells produce cytotoxic t-cells. helper t-cells produce cytokines to activate cytotoxic t cells and other cells of the immune system. cytotoxic t-cells attack abnormal body cells, while helper t-cells attack virally infected cells.