"Rule of law" refers to the

official name for the legislative branch of the national government of the United States
agencies such as the FBI, police department, or sheriff's department that make sure people obey the law
document that details the structure, functions, and powers of the government of the United States
principle that both those who govern and those who are governed must obey the law and are subject to the same laws

principle that both those who govern and those who are governed must obey the law and are subject to the same laws