问题如下：
Astrid is short 400 shares of ABC stock and the stock's current price is $95 per share. She wants to cover her short position if the price falls to $80.
Gail has 250 shares of BBC stock, which is trading at $86 per share, and he needs to buy another 150 shares if the price rises to $98. What orders should Astrid and Gail establish to meet their targets?
选项：
A.Astrid establishes stop buy at $80 and Gail establishes limit buy at $98.
B.Astrid establishes stop buy at $95 and Gail establishes stop buy at $86.
C.Astrid establishes limit buy at $80 and Gail establishes stop buy at $98.
解释：
C is correct.
Astrid should establish a buy order with a limit at 80 because she wants to buy stock to close out her short position if she can buy it at 80(or less).
Gail should establish a stop buy at 98 because this order will be executed only if the stock price rises to 98.
Astrid is short 400 shares of ABC stock and the stock's current price is $95 per share. She wants to cover her short position if the price falls to $80.
请问这句里面Astrid is short 400 shares of ABC stock 是什么意思？Astrid是short seller还是lender？cover her short position是什么意思？
