Answer:
Plato ⇒ Knowledge is innate.
According to Plato, humans had innate knowledge which means that they were born aware of certain concepts. He believed that some things humans knew were not gained from experience but were known from birth so had to be innate.
Locke ⇒ Humans have no innate knowledge.
According to John Locke, humans have no innate knowledge because he did not believe it possible for humans to have thoughts that they do not know of. For him, a person had to be taught something or thought of it themselves before they knew it.
Kant ⇒ Knowledge can be either a priori or a posteriori.
Immanuel Kant argued that knowledge could either be priori which meant that the knowledge possessed by a human could have been gained without experience as well as posteriori which meant that the knowledge was acquired from experience.