Which of the following is a zone of divergence? 10 points!

Which of the following is a zone of divergence? 10 points!?
a) between the Hadley cells
b)between the Ferrel cells
c)between the Polar cells
d)between Ferrel and Hadley cells
e)between Polar and Ferrel cells
f)between Hadley and Polar cells

please no Wikipedia entry! thanks!

Between the Ferrel and Hadley cells.