问题如下：
Hedge fund losses are most likely to be magnified by a:
选项：
A.margin call.
B.lockup period.
C.redemption notice period.
解释：
A is correct.
Margin calls can magnify losses. To meet the margin call, the hedge fund manager may be forced to liquidate a losing position in a security, which, depending on the position size, could exert further price pressure on the security, resulting in further losses. Restrictions on redemptions, such as lockup and notice periods, may allow the manager to close positions in a more orderly manner and minimize forced-sale liquidations of losing positions.
保证金制度使得投资者只缴纳一定比例的保证金，却能获得数倍于保证金金额的资产用于投资交易，这样会放大收益或损失，所以A正确；而锁定期，和赎回前的提前声明期设定都是为了尽可能得减少赎回操作本身带来的影响，并不是直接放大损失，故B、C不正确。
请问衍生品打margin call，需要回到IM；equity打margin call需要回到MM这样理解对么？
