Which artist invented the collage art form, and in what year? what are artists doing, or what principle are they following when they created a collage?

Georges Braque and Pablo Picasso both coined collage in the beginning of the 19th century, where the artwork is made from and assemblage of different forms this creating a new whole, it became a distinctive part of modern art

1)harmony-a2)balance-e3)asymmetrical balance-b4)abstract-c5)approximate symmetry-d