Why are cytokines important signals for cell-mediated immunity?

• A. Cell-mediated immunity requires immune cells to communicate to perform most efficiently.
• B. Cytokines are signals that allow immune cells to communicate.
• C. Effector cells, like CD4 cells, use cytokines to activate other immune cells.
• D. Cytokines signal to specific immune cells to increase their destructive properties and destroy pathogens.
• E. A and B.
• F. C and D.
• G. All of the above.