Please answer all Questions and provide working out

Using Delta-Hedging to hedge the risk in a short position in an option, the cost of hedging after discounti a. will generally be negative. b. will generally be zero. c. will generally be close to the theoretical Black-Scholes price of the option. d. will generally be close to the price of a futures contract with the same maturity. Clear my choice A binary option pays $100 if a stock price is greater than $30 in 18 months. The current stock price is $20, and its volatility is 30%. The risk-free rate is 2% and the expected return on the stock is 5%. What is the value of the option? a. $89.69 b. $10.56 c. $10.88 d. $56.12 Clear my choice