Laelle inc. is a company that sells apparel for women. it recently shut down its physical store and is operating as a completely app-based store now. the app allows users to access the store's products anytime and anywhere using their cell phones, and it also has features that allow users to compare the prices of products across different online stores. this scenario exemplifies

Consider a treasury bill with a rate of return of 5% and the following risky securities: security a: e(r) = .15; variance = .0400 security b: e(r) = .10; variance = .0225 security c: e(r) = .12; variance = .1000 security d: e(r) = .13; variance = .0625 the investor must develop a complete portfolio by combining the risk-free asset with one of the securities mentioned above. the security the investor should choose as part of her complete portfolio to achieve the best cal would be a. security a b. security b c. security c d. security d