which is the correct answer

An x% filter rule states that Select one: a. you should go long in the foreign currency (buy) whenever the currency falls x% below its most recent peak. b. you should go short in the foreign currency (sell) after the foreign currency has appreciated relative to the domestic currency by X% above its most recent trough. c. you should go short in the foreign currency (sell) whenever the currency falls x% below its most recent peak. d. you should go long in the foreign currency (buy) after the foreign currency has appreciated relative to the domestic currency by x% below its most recent peak. X