question: Helper T cells can be activated by 1.interacting with an infected cell expressing an antigen-MHC I complex. 2.interacting with a macrophage expressing an antigen-MHC II complex. 3.binding of their CD28 to B7 on antigen-presenting cells. a. 1 only b. 2only c.  1 and 2only d. 2 and 3only e. 1, 2 and 3

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