Which of the following is true regarding Eysenck's research and the categorization of psychopathology?

a) Eysenck's research supports the removal of schizophrenia from the diagnostic manual.
b) Eysenck's research supports a dimensionally based factor model of personality disorders.
c) Eysenck's research refutes any role of biological or genetic factors in most forms of psychopathology.
d) Eysenck's research supports the inclusion of abnormally high intelligence as a form of psychopathology.

Answer: b) Eysenck's research supports a dimensionally based factor model of personality disorders.