Memory Tc cells:.
a) are produced by the thousands, but they do not differentiate further the first time the antigen triggers an immune response.
b) immediately differentiate into helper T cells, producing a prompt, effective cellular response that can overwhelm an invading organism.
c) are highly mobile cells that roam throughout injured tissues.
d0 suppress the responses of other T cells and of B cells, and they limit the degree of immune system activation.