All of the Following Statements Regarding Interleukin-2 (IL-2)or Its Receptor

All of the following statements regarding interleukin-2 (IL-2) or its receptor are true except _____.

A) The low-affinity IL-2 receptor is a membrane-bound heterodimer composed of α and β chains.
B) IL-2 production increases approximately 100-fold if a co-stimulatory signal is delivered.
C) T-cell proliferation occurs upon binding of IL-2 to the high-affinity IL-2 receptor.
D) The high-affinity IL-2 receptor is assembled after T-cell activation.
E) Rapamycin is an immunosuppressive drug that inhibits signaling of IL-2 through the IL-2 receptor.