What type of task is the 'After Record Sourcing' trigger responsible for?

The 'After Record Sourcing' trigger is responsible for completing sourcing processes before further operations. This trigger occurs after a record's fields have been filled in based on sourcing rules but before the record is saved. It ensures that all necessary data is correctly populated from related records, such as when you create a transaction and relevant fields on that transaction are automatically filled in from a customer or an item record.

In the context of workflow and customization within NetSuite, this trigger helps to finalize data sourcing to guarantee that the most accurate and updated information is available for any subsequent actions or validations. By utilizing this trigger, developers can implement logic that relies on complete and sourced data before proceeding with tasks such as validations or other scripting operations that depend on the sourced values.

The other options describe tasks that occur at different stages in the record lifecycle, such as validation or updating defaults, which do not align with the specific purpose of the 'After Record Sourcing' trigger.