What are Kirchhoff's laws?

I. They allow to obtain the flow of current that runs through the different interconnecting derivations of an electrical circuit.
II. They were formulated by the German physicist Gustav R. Kirchhoff.
III. They were formulated by the German chemist Robert W. Bunsen.
IV. They were used to discover the cesium and rubidium elements.
a) I and II are correct.
b) I and III are correct.
c) II and IV are correct.
d) I and IV are correct.
e) II and III are correct.