According to Kant, the supreme principle that governs all morality is which of the following?

The categorical imperative, which states that we should only act in such a manner as to be able to will the maxim of our action as a universal law governing all actions.

The categorical imperative, which states that we should do unto others before they do unto us$.$

The categorical imperative, which states that we should do what is good for us with as little harm as possible to others.

The categorical imperative, which states that we should get money.