Three of the following methods were used by medieval french kings to increase their power. Which was not?

Medieval French kings used various methods to increase their power, including centralizing authority, establishing strong alliances through marriages, and expanding territorial control through conquest. However, one method that was not typically used was the promotion of democracy or popular governance, as feudal systems and monarchic rule dominated the political landscape during that time. Instead, the focus was on consolidating power within the monarchy and reducing the influence of the nobility.