Rational expectation refers to the expectation of an economic phenomenon, if people are rational, they will maximize. According to the definition above, Which of the following are rational expectations:. ['As soon as the branch of the provincial hospital was put into use, Xiao Chen opened a fruit store nearby.', 'Lao Qin learns that a certain policy is about to be implemented and conducts stock operations based on long-term stock experience.', 'Rumors say that a key middle school branch will be built in Chengnan, and old Liu immediately bought a house nearby.', 'Zhang learned that his college entrance examination score ranked 20th in the province, and he decided to apply for Tsinghua University first.']