sentences:  In this case, this strategy can be considered a neutral or bullish play, since the net credit may be kept if the underlying remains at or greater than the upper strike price when the options expire.This position has a complex profile in that the Greeks Vega and Theta affect the profitability of the position differently, depending on whether the underlying spot price is above or below the upper strike.When the underlying's price is at or above the upper strike, the position is "short" vega (the value of the position "decreases" as volatility increases) and "long" theta (the value of the position "increases" as time passes).