A whiteboard with a red title that reads 'DISCRETE MODEL BROWNIAN MOTION'. Below the title, there are four bullet points with corresponding numbers and letters. The first bullet point has the letter 'A' and the number '1', the second has the letter 'B' and the number '2', the third has the letter 'C' and the number '3', and the fourth has the letter 'D' and the number '4'. Each bullet point has a brief description in a smaller font.