A financial planner is examining the portfolios held by several of her clients. Identify which of the following portfolios is likely to have the smallest standard deviation: O A portfolio containing only Petro-Canada stock O A portfolio consisting of about 30 energy stocks O A portfolio consisting of about 30 randomly selected stocks Portfolio managers pick stocks for their clients' portfolios based on the investment objective of the client and several other factors. One key consideration is each stock's contribution to portfolio risk and its statistical relationship with the portfolio's other stocks. Based on your understanding of portfolio risk, which of the following statements are true? Check all that apply. The risk in a portfolio will increase if more stocks that are negatively correlated with other stocks are added to the portfolio. The portfolio's risk is not the weighted average of the individual stock's standard deviations. The market risk component of the total portfolio risk can be reduced by randomly adding stocks to the portfolio. When returns on Stock A increase, returns on Stock B also increase. In general, this would mean that Stocks A and B are positively correlated