What is the main theme of the article “Algunos desafíos del derecho constitucional del siglo XXI”?

I - The challenges faced by Constitutional Law in the 21st century.
II - The history of the Prudentia Iuris journal.
III - The personalistic perspective of Constitutional Law.
IV - The development of global institutions.
a) Only I and III are correct.
b) Only II and IV are correct.
c) Only I, III, and IV are correct.
d) All statements are correct.