与“购买看涨期权”相反的行为是什么?即,the opposite option of "buy call" 在欧式期权下,要等到期后才能进行交易,中途反悔了,想取消将来购买看涨期权所带来的结果To close out the buy call position,you n

与“购买看涨期权”相反的行为是什么?
即,the opposite option of "buy call"
在欧式期权下,要等到期后才能进行交易,中途反悔了,想取消将来购买看涨期权所带来的结果
To close out the buy call position,you need to enter into opposite trades to the original ones that opened the position.---------此句中的”opposite trades“是sell call还是buy put 还是sell put?

购买看跌期权.BUY PUT