To answer this question, let's go through each option to understand why it is correct or incorrect:
Option A) The TIBCO iProcess Engine is able to detect that the failure has occurred. This is important in order to take appropriate action when a database failure or failover happens.
Option B) The TIBCO iProcess Engine is able to guarantee the integrity of any in-progress transactions. This ensures that any transaction that was in progress at the time of the failure or failover is handled properly and does not result in data corruption or inconsistencies.
Option C) The TIBCO iProcess Engine is able to seamlessly continue working when the database connection returns, whether that connection is to the original database or a failover database. This ensures uninterrupted operation of the engine even when there are issues with the database.
Therefore, the correct answer is option D) All of the above. The TIBCO iProcess Engine is able to detect failures, maintain transaction integrity, and seamlessly continue working when a database failure or failover occurs.