A financial planner is examining the portfolios held by several of her clients. Which of the following portfolios is likely to have the smallest standard deviation? A portfolio consisting of about 30 randomly selected stocks A portfolio consisting of about 30 energy stocks A portfolio containing only Chevron stock Portfolio managers pick stocks for their clients' portfolios based on the investment objective of the portfolio 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, identify whether each statement is true or false