the top left is the original image which would be good for making a poster out of it would be good because it wouldn't lose resolution
the other two would be good for websites because they don't take up much space
the bottom right one is a GIF and i reduce to colors to 4 to save ink if it was used on leaflets

You have explained the reasons for the 4 different resolutions and for changing colour saturation. This means you have achieved D2.
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