Consider a bull spread where you buy a $40-strike call and sell a $40-strike call, suppose = 0.30, r = 0.08, T = 0. Suppose S0 = $40.. Consider a bull spread where you buy a $40-strike call and sell a $40-strike call, suppose ? = 0.30, r = 0.08, T = 0.5. a. Suppose S0 = $40. Please use the Black-Scholes formula to obtain the delta, gamma, vega, and theta for the spread. b. Suppose S0 = $45. What are delta, gamma, vega, and theta?