Which of the following does not describe one of the cognitive theories of depression?
a) Hopelessness depression develops when people make pessimistic attributions for the most important events in their lives.
b) The cognitive triad consists of negative views about oneself, the world, and the future.
c) Beck's theory emphasizes negative cognitive schemas.
d) Seligman's learned helplessness theory focuses on the individual's sense of control over their environment.