Assume that Mr. ABC holds a portfolio consisting of technology stocks and Mr. XYZ holds a portfolio consisting of real estate stocks. Both of these investors are planning to invest in some more stocks . The options available to them are: Microsoft (standard deviation=20%) ; Bank of America (standard deviation=15%) ; Walmart (standard deviation=10%) ; Toyota (standard deviation=5%) . Which stock is riskier for Mr. ABC and which stock is riskier for Mr. XYZ? Briefly explain.