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　　Which of the following regarding option strategies is/are not correct?
　　I  A long strangle involves buying a call and a put with equal strike prices
　　II  A short bull spread involves selling a call at lower strike price and buying another call at higher strike price
　　III  Vertical spreads are formed by options with different maturities
　　IV  A long butterfly spread is formed by buying two options at two different strike prices and selling another two options at the same strike price
　　A.  I only
　　B.  I and III only
　　C.  I and II only
　　D.  III and IV only
        FRM考試在線高清視頻指導(dǎo)