Consider the following data: - Price of stock now =P=845 - Standard deviation of continuously compounded annual returns ==0.2578 - Years to maturity =t=0.5 - Interest rate per annum =rf=0.5% for 6 months (1% per annum) - Beta of the stock =1.61 - Risk-free loan beta =0 a-1. Calculate the risk (beta) of a six-month call option with an exercise price of $845. (Do not round intermediate calculations. Round your answer to 2 decimal places.) a-2. Calculate the risk (beta) of a six-month call option with an exercise price of $695. (Do not round intermediate calculations Round your answer to 2 decimal places.) a-3. Does the risk rise or fall as the exercise price is reduced? b-1. Now calculate the risk of a one-year call with an exercise price of $845. (Do not round intermediate calculations. Round your answer to 2 decimal places.) b-2. Does the risk rise or fall as the maturity of the option lengthens