Which is the best measure of risk for a single asset held in isolation (Stand Alone Investment), and which is the best measure for an asset held in a diversified portfolio? a. Variance of the returns for the Stand-Alone Investment and the correlation coefficient for the asset relative to the other assets in the investment portfolio O b.Standard Deviation of Returns for Stand-Alone Investment and beta for the asset (investment) in a portfolio C. Beta is the best risk measurement for both scenarios O d. Beta for the Stand-Alone Investment and the variance of the returns for the asset when calculating portfolio risk