Using Android Enterprise versus Device Admin (DA) is recommended for all deployments going forward because:

The correct answer is "All of the above" because each statement accurately describes a reason why Android Enterprise is recommended over Device Admin (DA). The Device Admin API is indeed deprecated, meaning it's no longer actively developed and will eventually lose support, making it unsuitable for long-term deployments. Furthermore, DA's security and management model is considered outdated compared to the robust features offered by Android Enterprise. Android Enterprise provides a modern, comprehensive management framework with advanced enterprise APIs, enabling granular control, and secure application distribution through Managed Google Play, which are crucial for contemporary business needs.