<prompt> NK cell activity is enhanced by:IL1TNFIL 2TGFb  <response>: Ans. c IL 2Ref: Robbins 9thpg 192; 8thpg 188Cytokines secreted by NK cells: QInterferon-g IFN-g, which activates macrophagesIL-2 and IL-15 stimulate proliferation of NK cellsIL-12 activates killing and secretion of IFN-g 