The right of formation refers to the right of the right holder to change the legal relationship between himself and others according to his own behavior. Which of the following are forming rights. ['During the performance of the sales contract, because the seller is temporarily out of stock, the seller has to terminate the contract.', 'During the performance of the rental contract, the lessee requests a reduction in rent.', 'During the performance of the custody contract, the custodian requested an increase in custody fees.', 'During the performance of the loan contract, the creditor actively canceled the debt of the debtor.']