Which of the Following Is an Example of a Company's

Which of the following is an example of a company's standard operating procedure?

A) a general recommendation that all employees leave their work machines in good order
B) a compulsory practice of employees cleaning their work areas at the end of each day
C) an informal code of conduct prescribing that employees help each other if time permits
D) a suggestion by the technical department to save all work-related files on D drive
E) a recommendation by the HR department that employees wear formal clothes during the week