What triggers a rollback in a transaction scope?

A rollback in a transaction scope is triggered after a failure occurs and the error is not handled within an On Error Continue Scope. In a transactional context, if any error arises while executing the operations inside the transaction scope, the system needs to revert to the previous stable state to ensure data integrity. This is the fundamental purpose of a rollback — to undo any operations that were part of the transaction that could not be completed successfully.

If an error is encountered and there is no specific handling for that error, the entire batch of operations performed within the transaction scope will be rolled back, ensuring that no partial or errant data is left in the system. This mechanism is crucial in maintaining the ACID properties (Atomicity, Consistency, Isolation, Durability) of transactions, where the atomicity aspect specifically ensures that all operations in a transaction succeed or none at all.

The other options do not lead to a rollback scenario. For example, successful flow completion implies that all operations were executed correctly, so there is no need for a rollback. Similarly, calling a flow reference does not inherently cause a rollback; it continues to execute as part of the flow. A transaction is committed when all operations are completed successfully, at which point a rollback would not take place as