What is the name of the Brazilian river that is also known as Velho Chico and has a potential for hydroelectric power? I - The river São Francisco...

What is the name of the Brazilian river that is also known as Velho Chico and has a potential for hydroelectric power?

I - The river São Francisco is the largest river in Brazil.
II - The São Francisco river flows through five Brazilian states.
III - The São Francisco river has several perennial tributaries, including the Cariranha, Pardo, Grande and Das Velhas rivers.
IV - The São Francisco river has its largest navigable stretch between the cities of Pirapora (MG) and Juazeiro (BA), with 1,371 km in length.
a) I and II are correct.
b) II and III are correct.
c) II, III, and IV are correct.
d) I, II, III, and IV are correct.