IFC Import options. 
Namespace: Autodesk.Revit.DB.IFC
Assembly: RevitAPI (in RevitAPI.dll) Version: 24.0.0.0 (24.0.0.0)
Since:  2015 
Syntax
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Inheritance Hierarchy
SystemObject
Autodesk.Revit.DB.IFCIFCImportOptions
Autodesk.Revit.DB.IFCIFCImportOptions