The Capital Allocation Line provided by a risk-free security and N risky securities is

the line that connects the risk-free rate and the global minimum-variance portfolio of the risky securities.

the horizontal line drawn from the risk-free rate.

the line tangent to the efficient frontier of risky securities drawn from the risk-free rate.

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.

the line that connects the risk-free rate and the global maximum-variance portfolio of the risky securities.