You want an import to stop if a duplicate node is found. How do you do this? 

Answer options:

A. Set the duplicate error mode to Generate Error and Max Errorscount to 0.
B. Set the Unique String value to "Error" in the Duplicate Handling options.
C. Create a validation to find duplicates that runs after the import is processed.
D. Make sure that the EnableSharedNodes property is set to False.
E. Choose the option to skip Duplicate Members.

B