a) What was the Buy-and-hold return for the stock with ticker symbol ABVT from closing on Sept 3, 2021 to Sept 6, 2021? And for the stock with the ticker LG? b) What was the buy-and-hold return and what was the return day-by-day for the period Sept 3 , 2021 to Sept 6, 2021 for a portfolio that held 1 share of ABVT and 3 shares of LG on Sept 3 ? (Note that once the dividend is paid, it is held as cash in the portfolio)