In an excess of (NH₃(aq)), (Cu{2+}) ion forms a deep blue complex ion, (Cu(NH₃)₄{2+}), which has a formation constant (K_f = 5.6 × 10{11}). Calculate
a. [5.6 × 10{11}]
b. (11.2 × 10{11})
c. (5.6 × 10{-11})
d. (11.2 × 10{-11})