Which option correctly lists two types of RBC membrane proteins?

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Proteins associated with the red blood cell membrane fall into two main categories based on how they attach to the lipid bilayer: integral proteins, which are embedded in the membrane and often span it, and peripheral proteins, which attach to the membrane surface or to other membrane proteins. These two groups cover the primary ways membrane proteins exist and function. Transmembrane describes a feature of many integral proteins but isn’t itself a separate category, and extracellular or cytoplasmic descriptors refer to location rather than the mode of membrane association. Thus, integral and peripheral correctly list the two fundamental types of RBC membrane proteins.