gamma neutral

NO.PZ202108100100000408 问题如下 Lee’s put-basehee strategy for Solomon’s ETF position woulmost likelyresult in a portfolio gamma this: A.negative. B.neutral. C.positive. C is correct.Because the gamma of the stoposition is 0 anthe put gamma is always non-negative, aing a long position in put options woulmost likely result in a positive portfolio gamma.Gamma is the change in lta from a small change in the stock’s value. A stoposition always ha lta of +1. Because the lta es not change, gamma equals 0.The gamma of a call equals the gamma of a similput, whicproven using put-call parity. 中文解析根据题干可知，使用的是long put来进行对冲。对于call或者put，只要是long头寸，gamma都为正的；而不论call或者put只要是short 头寸，其gamma都是负的。因此本题选 请问，如果不是put-basehee strategy，而是call-basehee strategy，那本题中就是short call，那就是gamma为负了？

NO.PZ202108100100000408 问题如下 Lee’s put-basehee strategy for Solomon’s ETF position woulmost likelyresult in a portfolio gamma this: A.negative. B.neutral. C.positive. C is correct.Because the gamma of the stoposition is 0 anthe put gamma is always non-negative, aing a long position in put options woulmost likely result in a positive portfolio gamma.Gamma is the change in lta from a small change in the stock’s value. A stoposition always ha lta of +1. Because the lta es not change, gamma equals 0.The gamma of a call equals the gamma of a similput, whicproven using put-call parity. 中文解析根据题干可知，使用的是long put来进行对冲。对于call或者put，只要是long头寸，gamma都为正的；而不论call或者put只要是short 头寸，其gamma都是负的。因此本题选 不知道题目讲的是啥，也不知道这是哪个知识点，麻烦老师指导一下我。