Explanation
The finding that presents the most significant risk when reviewing the deployment of a new automated system is that data from the legacy system is not migrated correctly to the new system. Data migration is a critical process that involves transferring data from one system to another, ensuring its accuracy, completeness, integrity, and usability. If data migration is not performed correctly, it can result in data loss, corruption, inconsistency, or duplication, which can affect the functionality, performance, reliability, and security of the new system. Data migration errors can also have serious business implications, such as affecting decision making, reporting, compliance, customer service, and revenue. The other findings (A, B and D) are less significant risks, as they can be mitigated by rehiring or retraining personnel, providing user training, or adapting the system to different platforms.