How was da Vinci?s The Last Supper created, causing the belief that the painting will be completely lost one day? a.He used a very thin layer of dry plaster to create a version of a fresco that shortly began to peel away from the wall.b.He used a painting technique called sfumato, which proved to be ineffective in that time.c.He uses traditional light and abandons any previous methods used to depict religious scenes.d.none of the above