Build two models of chlorocyclohexane. On one model, replace the hydrogen labeled H_(a) with a chlorine atom to make model A; on the other model, replace the hydrogen labeled H_(b) to produce model B.

Which of the following correctly represents the models A and B?
a. Model A: H_(a)-C-Cl and Model B: H_(b)-C-H
b. Model A: H_(a)-C-H and Model B: H_(b)-C-Cl
c. Model A: Cl-C-H and Model B: H_(b)-C-H
d. Model A: H_(a)-C-Cl and Model B: H_(b)-C-Cl