What is the content of the first topic of the course 'Derecho Mercantil'?

I- Concept and sources of commercial law.
II- Subjective conception of commercial law: the law of merchants.
III- Objective conception of commercial law: the law of commerce.
IV- The legal regime of the market.
a) Only I and II are correct.
b) Only II and IV are correct.
c) Only I, II, and IV are correct.
d) All statements are correct.