Which of the following is the most important interaction in the formation of cell membrane lipid bilayer and in lipid-protein interaction?

Interactions in the cell membrane. -        Hydrophobic (most important)– Between lipids- Information of lipid bilayer​ Transmembrane proteins and lipids -        Van der walls interaction Between lipids- Information of lipid bilayer​ Transmembrane proteins and lipids -        Electrostatic bonds Between transmembrane and peripheral proteins -        Hydrogen bonds Between transmembrane and peripheral proteins -        Covalent bond (least important) Peripheral protein with the hydrophilic end of phospholipid