Choose the correct sentence.

no need Explanation. just only select correct sentence.

Select one:

a.

In practice, it is possible to get the portfolio variance equals 0.

b.

The covariance between assets is mostly responsible for the risk on the portfolio.

c.

The global minimum variance portfolio where short sale is allowed has lower expected return than the global minimum variance portfolio where short sale is not allowed.

d.

One of the assets is part of the efficient frontier when short sale is allowed.

e.

The efficient frontier comprises of the portfolios that have the minimum return than any other portfolio in its risk class.