Which statements about the drawing techniques leonardo da vinci, michelangelo, and vincent van gogh used in artworks are true? choose all answers that are correct. a. leonardo used the sfumato technique of blending and blurring chalk so edges nearly disappear. b. michelangelo used the hatching technique of drawing parallel lines close together. c. van gogh used a variety of expressive strokes to create different surfaces and textures. d. van gogh used the cross-hatching technique of filling certain areas with tiny dots to create value.