Which feature allows the application of environment variables in Copado?

The feature that allows the application of environment variables in Copado is Environment Variables. These are specifically designed to store configurations that can differ based on the environment in which the application is running, such as development, testing, or production. Environment variables help facilitate the management of settings that need to be dynamically changed without altering the core application code, ensuring that deployments are seamless and consistent across different environments.

In the context of Copado, using environment variables simplifies the setup and integration processes by allowing teams to maintain different configurations easily. This flexibility is crucial for DevOps practices, where different stages of development may require different settings without the risk of hardcoding values or introducing errors during deployments.

The other options do not specifically provide the functionality to handle environment variables in the same way. Custom settings are more about defining and storing configuration data that can be accessed within the application. Git snapshots are related to version control management and tracking the state of your codebase at a particular point in time. Apex scripts are used for executing specific actions in Salesforce environments but do not serve the purpose of managing environment-specific settings. Hence, Environment Variables is clearly the feature tailored for this requirement.