Can someone please answer?

Which one of the followings is not correct for diversification? Diversification benefit may not be achieved by just holding a lot of assets. For a well-diversified portfolio, the beta shouldn't be far away from 1. An international portfolio with a numerous countries of investments can benefit from diversification. Unsystematic risk can not be diversified away. With diversification, expected returns should be correlated more with systemeatic risks than unsystematic risk