E.N. Vestor has, ad December 2019, $3,000 of long-term capital losses. E.N. also has a stock in Z Co. held 9 months on which he has an unrealized gain of $5,000. Should he, in December 2019:

1. Sell enough stock to offset the capital losses;

2. Sell all of the stock in Z Co.; or

3. Leave the capital loss standing alone. Explain your answer.