问题如下：
2. For Subscriber 2, and assuming all of the choices relate to the KRW/USD exchange rate, the best way to implement the trading strategy would be to:
选项：
A.write a straddle.
B.buy a put option.
C.use a long NDF position.
解释：
C is correct.
Based on predicted export trends, Subscriber 2 most likely expects the KRW/USD rate to appreciate (i.e., the won—the price currency—to depreciate relative to the USD). This would require a long forward position in a forward contract, but as a country with capital controls, a NDF would be used instead. (Note: While forward contracts offered by banks are generally an institutional product, not retail, the retail version of a non-deliverable forward contract is known as a -contract for differences- (CFD) and is available at several retail FX brokers.)
A is incorrect because Subscriber 2 expects the KRW/USD rate to appreciate. A short straddle position would be used when the direction of exchange rate movement is unknown and volatility is expected to remain low.
B is incorrect because a put option would profit from a depreciation of the KRW/USD rate, not an appreciation (as expected). Higher volatility would also make buying a put option more expensive.
请问，我理解做这道题应该不用判断货币的升贬值方向，只需要明白波动性变大就可以了；B和C都应该是对的因为都没有说明是针对哪种货币，但是相比之下用futures因为不需要抵押品、面对的对手方风险更小，所以选NDF futures。是这样对吗？
