Here is a simple application, anybody can help?

Hello,

bellow I have attached an image for an application that I am working on, I just received the RouterBoards today and this is my first time I touch one of those! the question is, which is the best way to establish a bridge between these two RouterBoards? WDS, nstreem or just client-to-AP?

I found two options in Wireless interface: station WDS and WDS slave, do I have to configure the first board as station and the other as slave?

thanks,
wapp.JPG