How does the Winogradsky column differ from Koch's plate media?

A) Koch's media creates a gradient from oxygen-rich conditions at the surface to highly reduced conditions below.
B) The Winogradsky column is used for culturing viruses.
C) The Winogradsky column is used for growing extremophiles.
D) The Winogradsky column uses the kinds of nutrients that feed humans.
E) The bacteria that Winogradsky isolated can grow only on inorganic minerals.