What should a system administrator consider before importing a set of records into Salesforce.

What should a system administrator consider before importing a set of records into Salesforce.
A . The import file should include a record owner for each record
B . Validation rules are not triggered when importing data using the import wizard .
C . Data should be de-duplicated in the import file prior to import
D . Currency field values will default to the personal currency of the record owner

Answer: A, C