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