Zinc is more active than cobalt and iron but less active than aluminum. Cobalt is more active than nickel but less active than iron. Which of the following correctly lists the elements in order of increasing activity?
a) Zn < Al < Co < Ni < Fe
b) Co < Ni < Fe < Zn < Al
c) Fe < Ni < Co < Al < Zn
d) Ni < Co < Fe < Zn < Al
e) Ni < Fe < Co < Zn < Al