Which of these images shows the correct orientation of phospholipids in a biological membrane?

Phospholipids all have a hydrophilic head (phosphate and specialized group in red) and a hydrophobic tail (glycerol and fatty acids in yellow).

Glycerophospholipids correspond to the combination of glycerol, two fatty acids (in yellow), a phosphoric acid and alcohols or amino acids. Alcohols or amino acids give the identity and characteristic of glycerophospholipids. Among the amino acids we find serine and among the alcohols we find inositol, ethanolamine and choline; phosphatidyl serine, phosphatidylinositol, phosphatidyl ethanolamine and phosphatidyl choline are thus obtained.

well the answer is 2!