According to Plato's doctrine of forms can humans create a perfect square

To put it in Plato's terms, the concept and ideal of Square resides in the Realm of Forms and is, therefore, perfect, abstract, and unchanging. Plato would say that this Form of Square is more real than our physical drawings of a square

Dont really know what the answer is

Iwould say d) signed unknown street singers who brought original songs to record.