Which of the following statements are true about the diathesis stress model?
i. A vulnerability factor and the presence of a pathogenic stressor results in psychological disorder.
ii. The presence of biological aberration is enough to develop a psychological disorder.
iii. The presence of only pathogenic stressors may lead to psychopathology.
iv. The diathesis and the stressor lead to the development of a psychological disorder.
a. i and ii
b. ii and iii
c. iii and iv
d. i and iv
