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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
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