What are the two likely causes of the error?

An Adobe Campaign developer uses an Import workflow to load data from an external source, but finds that duplicate entries are created in the recipient table .

What are the two likely causes of the error? Choose the two correct answers.
A . The Update data activity is set to the ‘insert’ option.
B . The file was not deduplicated before the importing workflow.
C . A deduplication step is missing in the workflow.
D . The identifier was not configured property.
E . The reconciliation option in the Update data is set up improperly.

Answer: A,D