According to widely accepted "fluid mosaic model" cell membranes are semi-fluid, where lipids and integral proteins can diffuse randomly. In recent years, this model has been modified in several respects. In this regard, which of the following statements are incorrect -

1. A. Proteins can also undergo flip-flop movements in the lipid bilayer
2. B. Many proteins remain completely embedded within the lipid bilayer
3. C. Proteins in cell membranes can travel within the lipid bilayer
4. D. Proteins can remain confined within certain domains of the membranes

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