Which one of the following is least apt to reduce the unsystematic risk of a portfolio?

Group of answer choices

Adding additional shares of each stock in a portfolio to that portfolio

Adding bonds to a stock portfolio

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Which of the following is true about calculating expected portfolio returns and variances?

Group of answer choices

Return is not needed to calculate the portfolio variance.

Return and variance are independent of the possible states of nature.

Return can be calculated using the expected return and weights for each asset.

Variance is generally a weighted average of the variances of the individual assets in the portfolio.

Adding international securities into a portfolio of U.S. stocks

Adding U.S. Treasury bills to a risky portfolio

Adding technology stocks to a portfolio of utility stocks