Excel Question. Download the monthly General Motors (GM), Apple (AAPL) and Bank of America (BAC) prices from September 2011 until 1 September 2022.(a)Build the investment opportunity set using the three stocks for the following expected returns: (0.6%,0.8%,1%,1.2%,1.4%,1.6%,1.8%,2%,2.2%,2.4%,2.6%)(b)Find the efficient frontier. What is the expected return of the minimum variance efficient portfolio?