What is buon fresco?
a. a good fresco painting
b. when paint is applied to dry plaster wall
C. a technique in which water based paints are applied on wet plaster
d. none of the above

when paint is applied on wet plaster

Explanation:

buon fresco is Italian for true fresh. This different than a buon-secco which is when paint is applied to dry plaster. The word secco is close to the word dry in Spanish.

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