Which statement is true regarding the developer environment?

The statement regarding the developer environment that is true is that envelopes are always free. In a developer environment, DocuSign provides a sandbox for developers to test and build integrations without any cost associated with the envelopes they create. This allows developers to experiment with various functionalities, API calls, and features without any financial implications. As a result, they can develop and refine their applications effectively.

The other options contain truths about DocuSign’s operational dynamics but do not apply to the developer environment specifically. While envelopes are legally binding in production environments, that aspect does not apply to the testing context of the developer environment. Integration keys are actually required to authorize API calls, even in the developer environment, ensuring secure and controlled access to the functionalities. Lastly, while multiple users may interact with and review an envelope, the typical use-case involves a sequence of actions rather than simultaneous access in a traditional sense. Therefore, the primary focus of the developer environment is to allow free usage of envelopes solely for development and testing purposes.