Upon thorough analysis of various theories of personality, which of the following substantive statements is most authentic with reference to William Herbert Sheldon's Somatotype Theory and Hans Eysenck's Trait and Biological Theory (PEN Model)?

William Herbert Sheldon classified personality based on somatotypes into endomorphic (round and soft), mesomorphic (muscular and athletic), and ectomorphic (thin and delicate) categories. On the other hand, Hans Eysenck, in his three-dimensional (PEN model) theory, linked psychoticism, extraversion, and neuroticism to biological and genetic factors. For more information on this subject, you can refer to the Wikipedia reference.