Final answer:
The in-house developed and now unsupported database is considered a 'legacy system.' Legacy systems are outdated yet still in use and present challenges in maintenance, upgrades, and integration with modern systems.
Step-by-step explanation:
The question pertains to a company that uses a database which was developed in-house but is no longer supported after the departure of the developer. The correct classification of this database is a legacy system. A legacy system refers to outdated computer systems, software, or applications that are still in use, despite there being more modern alternatives available. They can create various challenges, such as difficulties in maintaining, upgrading, or integrating with newer systems.
However, the company continues to rely on this database because it serves specific business needs or because switching to a new system can be costly and complex. Legacy systems often contain valuable data that must be handled with care during any migration process. In some cases, there may be a lack of documentation or expertise available to support these older systems, which adds to the challenge.
BYOD (Bring Your Own Device), Embedded systems, and UTM (Unified Threat Management) are unrelated terms and do not apply to this scenario. BYOD refers to the practice of employees bringing personally owned devices to their place of work, embedded systems are computing systems with dedicated functions within larger systems, and UTM refers to a comprehensive solution that has evolved from the traditional firewall into an all-inclusive security product.