What are the different layers of the gastrointestinal tract in the order they appear from innermost to outermost?
1) Mucosa, submucosa, muscularis externa, serosa
2) Mucosa, submucosa, serosa, muscularis externa
3) Muscularis externa, mucosa, submucosa, serosa
4) Muscularis externa, mucosa, serosa, submucosa

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