Put 3.0 if you want to support devices with iOS 3.0+.
However, if you do this, be sure you do not use code that will not run on iOS 3.0. If you do, you will have to check which version is being run with preprocessor directives. If you do a Google search, you'll hit a lot of results. People wanting to support older iOS devices is common.
If you only want to support the latest and greatest, put 4.3 and be done with it.
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