What historians refer to as the Second Industrial Revolution took place when?

What historians refer to as the Second Industrial Revolution took place when?

the beginning of the 19th century and the end of World War I.

the beginning of the 19th century and the beginning of World War II.

the last third of the 19th century up to the beginning of World War I.

the last third of the 19th century up to the end of World War I.