Compatibility of ARC and Storyboard

Question

What's the compatibility of ARC and Storyboard considering devices and iOS?

Will ARC and Storyboard work on iPhone 3G, 3GS, 4 and 4S?

Will ARC and Storyboard work on iOS 4 and 5?

Answer 1

ARC runs with 5.0 or higher, Storyboard also needs iOS 5. Therefore, both are potentially available with the iPhone 3GS and above.

EDIT: Obviously, ARC is also compatible with iOS 4.0 and above, once you don't use weak. I briefly tested it, seems to work. That would mean that the iPhone 3G would also be compatible.