Wireless Mode. Which one?

Replacing my defunct Airport Express and adding it to my wireless network, Airport Utility only seemed to give me one option: join an already existing network, but the Wireless Mode options include join a wireless network, participate in a WDS network, and extend a wireless network. Can anyone parse out the differences between these?  

"Join a wireless network" is used to connect the AirPort Express to an existing wireless network for use with AirTunes or to connect a remote printer using the USB port on the Express.
"Extend a wireless network" is used if you want the AirPort Express to perform the same functions as "join" and also provide more wireless coverage in the area where it is located. You must have an Apple "n" main wireless router for this to work.
"WDS" performs the same as "join" and "extend", but is used with an older "b/g" Apple main wireless router.

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