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 portfolio of the risky securities that has the highest expected return on the efficient frontier. B. the line tangent to the efficient frontier of risky securities drawn from the risk-free rate. C. the horizontal line drawn from the risk-free rate. D. the line that connects the risk-free rate and the global minimum-variance portfolio of the risky securities.