Using the data from Problem 1, what is the optimum portfolio assuming short sales are allowed but

Question:

Using the data from Problem 1, what is the optimum assuming short sales are allowed but riskless lending and borrowing are forbidden?
In Problem 1

Portfolio
A portfolio is a grouping of financial assets such as stocks, bonds, commodities, currencies and cash equivalents, as well as their fund counterparts, including mutual, exchange-traded and closed funds. A portfolio can also consist of non-publicly...