NO.PZ2020021203000062
问题如下：
Why is an employee stock option on a non-dividendpaying stock sometimes exercised before maturity?
选项：
解释：
An employee stock option cannot be traded. Thus, if the employee does not want a position in the company's stock, the only alternative will be exercising the option and selling the stock.
答案为什么前面说员工股票期权不能交易，后面又说可以sell？
