What do you use for a hard edged shadow?

The Sun, for example, is the largest light source in the solar system. But, because it's 93 million miles away, it is considered a small hard light source. This is why it produces such contrasty hard edged shadows.

Explanation:

(happy to help)

i think the answer could be either a or b because both are part of the post production part. hopefully this you a little.