Honesty and credit: It means that the actor is required to act in accordance with the reciprocity of the market system. When signing a contract, be honest and not deceived. After signing the contract, keep its promises and learn by itself. According to the above definitions, what does the following behavior of A not violate the good faith? ["A and B enter into a malicious collusion agreement to enter into a sales contract that harms the interests of A's agent.", 'A conceals the fact that his house will be demolished and transfers his house at market price.', 'A deliberately leaks the trade secrets of others.', 'B did not deliver the goods before fulfilling the contractual obligations. Therefore, A who later fulfilled the contractual obligations refused to pay the goods.']