Which sequence below represents the correct order of the tunics of the GI tract, starting from the layer adjacent to the lumen and moving superficially?

mucosa, muscularis externa, submucosa, serosa

serosa, mucosa, muscularis externa, submucosa

submucosa, mucosa, muscularis externa, serosa

mucosa, submucosa, muscularis externa, serosa

muscularis externa, serosa, submucosa, mucosa

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