When Mylan acquired the rights to the EpiPen in 2007, what innovative product design change did they implement that significantly improved usability in emergency situations?

The EpiPen auto-injector has saved countless lives by providing emergency treatment for severe allergic reactions. This life-saving device has undergone significant design changes since its introduction, becoming a critical product in emergency medicine. Test your knowledge about this iconic medical device's development and the company behind it.

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They added a color-coded cap system with blue to indicate the needle end and orange for the thumb placement
They redesigned it with a hidden needle that automatically retracts after injection to prevent accidental needle sticks
They incorporated an electronic voice guidance system that provides step-by-step instructions during use
They added a temperature-sensitive indicator that changes color if the medication has been exposed to harmful temperatures