What is the consequence of unauthorized changes made by users?

The consequence of unauthorized changes made by users is potential technical problems. When users alter system configurations, code, or data without proper authorization or oversight, it can lead to a range of issues. These may include software malfunctions, data corruption, security vulnerabilities, and conflicts between different system components. Such technical problems can disrupt normal operations and may require significant time and resources to resolve.

In contrast, the other options suggest positive outcomes that are unlikely to result from unauthorized changes. Improved system functionality and increased operational efficiency imply that changes are beneficial and properly executed, while reduction in downtime suggests a stable environment where unauthorized modifications typically do not lead to problems. Thus, the actual consequence of unauthorized modifications is a risk to the overall integrity and reliability of the system, which is why potential technical problems are the correct answer.