"Guarantee" means a guaranteed method in which the third party and the creditor agree that when the debtor fails to perform or cannot perform the debt, the third party performs the obligation or assumes liability in accordance with the agreement or the law. Which of the following are guaranteed? ['A company borrows 1 million yuan from a bank, and if it is unable to repay after the guarantee period expires, it can sell its own machinery and equipment for repayment.', 'When Liu borrowed 20,000 yuan from Xuemou, Chen assured Liu that he would help pay it back then.', 'After Zhang borrowed 70,000 yuan from Huang, he said that if he could not repay it by that time, he promised to ask Hu to pay it on his behalf.', 'A borrows 50,000 yuan from B, and C promises to be repaid by A when B is unable to pay.']