Which write action can simplify the integration process by automatically determining insert or update?

The choice of Upsert as the correct answer is based on its unique capability to handle both insert and update operations in a single action. An Upsert operation intelligently checks the existence of a record in the database. If the record is found, it updates the existing record with the new data; if the record does not exist, it creates a new entry. This dual functionality significantly simplifies the integration process since you do not need to define separate actions for inserting and updating records.

In contrast, choices like Create, Delete, and Update have more specific functionalities. Create is solely focused on adding new records and cannot handle updates to existing ones. Delete is used exclusively for removing records from the database, and Update strictly modifies existing entries without the ability to insert new records. Therefore, Upsert stands out as the most efficient option for scenarios where the necessity to handle both inserts and updates arises.