46. (3 points) You observe two portfolios in the market as follows: Portfolio 1: return =20% and volatility =24% Portfolio 2: return =15% and volatility =20% Which of the following is the candidate of an efficient portfolio? (a) A portfolio with a return of 14% and a volatility of 22%. (b) A portfolio with a return of 19% and a volatility of 25%. (c) A portfolio with a return of 22% and a volatility of 30%. (d) None of the above