The hypothesis that people know the 'true model' of the economy and that they use this model and all available information to form their expectations of the future is the?

(A) rational-expectations hypothesis.
(B) active-expectations hypothesis.
(C) atic-expectations hypothesis.
(D) adaptive-expectations hypothesis.

The hypothesis that people know the ‘true model’ of the economy and that they use this model and all available information to form their expectations of the future is the?