Which of the following best describes Immanuel Kant's categorical imperative?

A$.$ You should act towards others as you would like them to act towards you.

B$.$ If an action is not right for everyone to take, it is not right for anyone to take.

C$.$ If an action cannot be taken repeatedly, then it is not right to be taken at any time.

D$.$ One can put values in rank order and understand the consequences of various courses of action.

E$.$ One should take the action that produces the least harm or incurs the least cost.