The certainty equivalent rate of a portfolio is

A$.$ the rate that a risk$-$free investment would need to offer with certainty to be considered equally attractive as the risky

portfolio.

B$.$ the rate that the investor must earn for certain to give up the use of his money.

C$.$ the minimum rate guaranteed by institutions such as banks.

D$.$ the rate that equates $"$ A $"$ in the utility function with the average risk aversion coefficient for all risk$-$averse investors.