In Adobe Illustrator CC, you can open a new document by clicking New in the menu or
pressing Cmd+N

In Adobe Illustrator CC, you can open a new document by clicking New in the file menu or  pressing Cmd+N.

Explanation:

Alternatively, you can also use a keyboard shortcut for creating a new document. You need to press Cmd+N on the keyboard and a new document opens.

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answer; its the top layer;