Answer: X and Z

## Explanation In modern portfolio theory, the **efficient frontier** represents the set of optimal portfolios that offer the highest expected return for a defined level of risk, or the lowest risk for a given level of expected return. Based on standard portfolio theory: - The efficient frontier includes all portfolios that lie on the upward-sloping portion of the minimum-variance frontier - It excludes portfolios that are dominated by others (those with lower returns for the same risk or higher risk for the same return) - The efficient frontier typically spans from the **minimum variance portfolio** to the **maximum return portfolio** Given the options: - **Option C (X and Z)** would typically represent the range from the minimum variance portfolio to the maximum return portfolio, which constitutes the efficient frontier This is a fundamental concept in portfolio optimization where investors seek to maximize returns for a given level of risk by selecting portfolios along the efficient frontier.

Author: LeetQuiz .