please help me solve both questions !

22. The Capital Allocation Line provided by a risk-free security and N risky securities is A. the line that connects the risk-free rate and the global minimum-variance portfolio of the risky securities. B. the line that connects the risk-free rate and the portfolio of the risky securities that has the highest expected return on the efficient frontier. C. the line tangent to the efficient frontier of risky securities drawn from the risk-free rate. D. the horizontal line drawn from the risk-free rate. 27. Which of the following statements is true regarding the optimal risky portfolio: A) It is designated by the point of tangency with iso-utility curve and the capital allocation line. B) It is designated by the point of highest Sharpe ratio in the opportunity set. C) It is designed by the point of tangency with the opportunity set and the securities market line. D) This portfolio gives the highest standard deviation risk per unit of risk premium in the opportunity set