The boundary issue refers to the short-sighted behavior of employees in modern enterprises due to the short employment relationship, and the harm caused to such enterprises by such behaviors. Which of the following are boundary issues:. ['Because he retired in one year, Lao Zhao felt powerless, and his work efficiency became worse and worse.', 'Because he is unfamiliar with the business, Xiaoli, who has just arrived for a month, lost a big customer and the company suffered huge losses.', 'Because he feels that the turnaround is slim, during the probation period, Xiao Wang works hard every day to show himself.', 'Because only a half-year contract is signed, Xiao Sun ignores the use of working machines and equipment.']