An example of a norm is

Multiple Choice

a general mandatory guideline requiring all employees to leave their work machines in good order.

a specific mandatory guideline asking employees to oil machine parts labeled A and B and replace C and D$.$

an informal code of conduct recommending that employees help each other if time permits.

a requirement by the human resources department that employees wear formal clothes during the week.

a suggestion by the technical department that all work$-$related files are saved in a common location.