Hello, I'm having trouble figuring this out. Can you help me?

Which of the following statements regarding coefficient of variation is NOT correct?

Coefficient of variation is the standard deviation divided by the expected return.

Coefficient of variation provides a more meaningful risk measure when the expected returns on two alternatives are not the same.

Coefficient of variation shows the risk per unit of return.

The stock with higher coefficient of variation is less risky than the stock with lower coefficient of variation.