What feature must be activated to avoid automatic overwriting of code in a multi-developer environment?

In a multi-developer environment, it is crucial to manage code changes effectively to prevent conflicts and overwriting of each other's work. The feature that must be activated to help with this situation is Online Conflict Resolution.

When this feature is enabled, it allows developers to identify and resolve conflicts in real-time while working in the same development branch. This mechanism provides visibility into changes made by other developers and facilitates a collaborative approach to integrating code, ensuring that no one's contributions get lost or overwritten unintentionally.

In contrast, the other options do not directly address the principle of preventing code overwriting. Ordering User Stories by feature helps in organizing work but does not prevent conflicts. Apex Test Validation deals with testing code rather than managing changes. Data Import Templates focus on importing data and are unrelated to code management. Therefore, Online Conflict Resolution is specifically designed to tackle the challenges posed by multiple developers working on the same codebase concurrently.