Uploading IPhone App For Review

Im just at the step of using the application loader to upload my iphone app to the 开发者_如何学编程app store.

My question is (and im sure its a dumb question, and im sorry for that) when i get to the step of the application loader where it is asking to choose a file to upload, WHAT FILE DO I NEED TO SELECT?

Thanks in advance

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Your application bundle (.app), archived with zip (you can do it in the Finder -- right click on your .app and choose Compress).