The operating system widely used by graphic designers is the operating system.
O Windows
Mac
O Linux
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Mac

Explanation:

Market perception generally see Mac-products to be more user Friendly compared to  Windows products.

Since designers prefers pleasing UI and small details rather than the flexibility of the system, most designers usually prefer Mac compare to windows or Linux products

Even though Windows have more market share in general (around 75%) , designers as a specific group of consumers generally prefer to use Mac compared to windows.

b) the planets year length would be longer

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