<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A group of scientists studied the effects of cytokines on effector cells, including leukocytes. They observed that interleukin-12 IL-12 is secreted by antigen-presenting cells APCs in response to bacterial lipopolysaccharide. When a CD4 T cell is exposed to this interleukin, which of the following responses will it have?? A: Cell-mediated immune responses, B: Activate B cells, C: Secrete IL4, D: Releases granzymes, E: Responds to extracellular pathogens,  <response>: This is a question about the effects of interleukin-12 IL-12 on CD4 T cells. IL-12 is secreted by antigen-presenting cells in response to bacterial stimuli. It promotes cell-mediated immunity by stimulating CD4 T helper 1 Th1 cells. Th1 cells secrete cytokines like IFN-gamma that activate macrophages and cytotoxic T cells. So the effect of IL-12 exposure on a CD4 T cell would be to stimulate cell-mediated immune responses.A: Cell-mediated immune responses 