Which of the following structures represents trans isomer.

I $\Rightarrow$ Cl (equatorial (e) and Br (axial) (a) (OR)
$\Rightarrow$ Cl (downward) and Br (upward) Hence trans
II $\Rightarrow$ Br (downward) (e) CH, (upward) (e) Hence trans
III $\Rightarrow$ Both CH, and Br downward. Hence cis
IV $\Rightarrow$ Both Br and Cl downward. Hence cis