I have IPad model md368ll/a. Which ipad do I have?

I have IPad model md368ll/a. Which ipad do I have? Is it a 3rd generation? Does it have retina display? All I know is my screen is much more clear than my wife's version 1 ipad. On this model that I have, should I load iOS 7? Cnet says iOS 7 slows down older iPads but I am not sure if mi ipad would be considered "old"????

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