A financial planner is examining the portfollos held by severat of her clients. Which of the following porfolios is wikey to hive the smaliest standard deviation? A portfolio containing only Chevron stock. A pertfolio consisting of about 30 randomly selected stocks. A portfollo consisting of about 30 energi stocks. Portfolio managers pick stocks for their cients' portfolios based on the investment objective of the portfolio and several ather foctors. One key consideration is each stock's contribution to portfolio risk and its statistical relationstilp with the portfollo's other stocks. Based on your understanding of portfolio risk, ldentify whether each statement is true or false