Assume the CAPM holds and the return on the market portfolio is 10%, its standard deviation is 10% and the risk-free rate is 5%. Can each of the following assets exist in equilibrium? Explain.

a) A bond with expected return 0% and standard deviation 1%

b) A put option with expected return 50% and standard deviation of 100%

c) A stock with an expected return of 10% and the standard deviation of 9%

d) A call option with Sharpe ratio expected to return 15% and standard deviation 20%