In order to reduce corporate wage costs and weather the financial crisis, Great Wall Steel plans to reduce some employees. After discussion and decision by the board of directors of the factory, the first employees to be reduced are those with extremely inefficient wages, rather than layoffs based on length of service, as some companies. Which of the following premise does the decision of Great Wall Steel Works best have? ['The efficiency of each employee is different.', 'Inefficient employees are not good employees.', 'There are feasible ways to judge the efficiency of work.', 'Every employee, especially those skilled workers, will have his own skills.']