Which of the following systems features unchangeable laws dictated by a ruler?

In a monarchy, particularly in an absolute monarchy, the ruler wields significant power and authority, often claiming that their right to rule is divinely sanctioned or historical. This form of governance is characterized by the belief that the monarch's laws and decrees are unchangeable, as they are seen as emanating directly from the ruler’s will. In such a system, the monarch's decisions often lack the need for approval or input from other governing bodies or the public, distinguishing it from other systems like democracy, where laws are subject to change through public debate and voting, or from oligarchy and socialism, which feature collective or shared governance rather than that of a singular, unyielding ruler. The concept of unchangeable laws under a ruler captures the essence of absolute monarchy and explains why this choice is the most accurate representation of the system described in the question.