Article 2 of the Texas Constitution states: "... Those which are Legislative to one;
those which are Executive to another, and those which are Judicial to another; and
no person, or collection of persons, being of one of these departments, shall exercise
any power properly attached to either of the others, except in the instances herein
expressly permitted."
Which principle does this statement illustrate?

limited government

federalism

separation of powers

popular sovereignty