ABC三个选项，分别是什么意思啊，没有读懂

为什么牛市低波动就short put？不能也longcall吗？

课后题R13，第4题选项C，后半段，为什么要match duration呢？

第三题怎么理解？

56，谢谢老师

第一题，下面这句话代表了什么，怎么就说明交易策略是抢跑了？on the assumption that a trader seeks liquidity and is executing a large buy order by breaking it into pieces.

最后eg里为什么要用int的4×1/12,这个1/12的意义是什么？

老师，第二题， TNOCF 里NWCInv等于40是怎么算出来的？

请问，下面官网题中，Long是养老金的人啊，就是客户，客户被investemnt manager邀请，应该都可以接受吧？那如果invest manager想给客户组织一个豪华旅行，客户可以接手啊？Q. Long has been asked to be the keynote speaker at an upcoming investment conference. The event is being hosted by one of the third-party investment managers currently used by his pension fund. The manager offers to cover all conference and travel costs for Long and make the conference registrations free for three additional members of his investment management team. To ensure that the conference obtains the best speakers, the host firm has arranged for an exclusive golf outing for the day following the conference on a local championship-caliber course.

在反优化中，知道weight，不知道预期收益，收益率的波动率和收益率之间的相关系数都是根据收益计算的，怎么能知道？