What are the fundamental principles of the Market Economy system?

I. Unrestricted respect for private property.
II. Non-intervention of the State in productive and economic matters (limited State).
III. Entrepreneurial freedom and openness to the outside.
IV. Market and price freedom (subject to the Law of Supply and Demand).
a) I, II and III are correct.
b) II, III and IV are correct.
c) I, III and IV are correct.
d) All statements are correct.