Operation Mode of 2nd AP

Hi,

I have 1 Access Point (Model: WL-524 - 3Com) and recently bought
another(same model).

How i have to configure the "operation mode" of the 2nd ap? The options are:

Access Point(Default)
Ap Client
Ap Repeater
Point to Point Bridge (WDS)

The access control by MAC Address is enabled, so i don't want to add
twice the mac address of new clients.