What security approach combines various technologies to protect the same asset?

The concept that best captures the idea of combining various technologies to protect the same asset is Defense in Depth. This security strategy involves implementing multiple layers of security controls throughout an IT environment, ensuring that if one layer is bypassed, additional layers continue to provide protection.

By relying on diverse security mechanisms—such as firewalls, intrusion detection systems, encryption, and access controls—Defense in Depth creates a robust defense strategy that mitigates risks effectively. This layered approach is essential in today's complex threat landscape, as it addresses the fact that no single security measure is foolproof.

In contrast, the other options represent different concepts. A Demilitarized Zone typically refers to a network segment created to bolster security by isolating internal systems from external networks, but it does not specifically imply the use of multiple technologies. Database Activity Monitoring focuses on safeguarding databases by monitoring and analyzing database activity but does not encompass a broader multi-layered approach. Data portability pertains to the ability to transfer data between different systems and environments, which is unrelated to the concept of layering security measures.