Civil single-method legal act: It refers to a legal action that can be established according to the expression of the intention of a civil subject. According to the above definition, which of the following is single-method laws? ["According to Citizen John's imitation at a university in China, renting 406 rooms of the university's academic center for a period of three months.", 'Wang Yi deposited 4,500 yuan in cash on the automatic deposit machine.', 'Wang Er found out that the shampoo was used up. After paying at the vending counter in the supermarket downstairs, he took a bottle of shampoo.', 'After Zhang moved, he abandoned a set of old sofas and a 40% new washing machine and discarded them in the garbage collection and recycling department of the community.']