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