Sets the type of curve that results once the selected edges are converted.
            
- Open
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                     Creates a curve with disconnected start and end points.
                      
 
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                     Creates a curve with connected start and end points. If the selected edges do not form a closed loop, Maya will automatically
                        connect the two open endpoints.
                      
 
-   
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                     Creates a Periodic curve if the selected edges form a closed loop. Creates an Open curve otherwise.
                      
 
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                  The higher the Curve Degree, the more control you have over the curve’s smoothness. The default setting (3 Cubic) works well
                     for most curves.