Air Products & Chemicals, Inc. $($APD$),$ Amazon.com, Inc. $($AMZN$),$ ASML Holding NV $($ASML$),$ Union Pacific Corporation $($UNP$),$ West Fraser Timber Co$.$ Ltd $($WFG$),$ S&P $500$ Index $($GSPC$)\mathrm{.}1.(10$ points$)$ Download monthly Adj. close prices $($already adjusted for dividend and stock split$)$ for each stock from $12/01/2013$ through $12/31/2023($from Yahoo Finance$).$Part$-$A: In solving steps $2$&$3,$ assume that the latest monthly T$-$bilL rate is $40\%.$ Use the solver function to find the optimal portfolio $($portfolio B$)$ with short sale restrictions.