What is the name of the documentary reviewed by Raúl Andrés Guillén Rangel?

The documentary is about the history of electricity.
The documentary is the second part of a series.
The documentary talks about the relationship between electricity and magnetism.
The documentary covers the period of the Middle Ages.
The invention of the Voltaic battery is mentioned in the documentary.
a. The Age of Inventions
b. The Middle Ages and Electricity
c. The History of Electricity 2/3: The Age of Inventions
d. The Discovery of Electricity and Magnetism