The solution meets the goal because setting auth_enabled=True for an AciWebservice instance enables key-based authentication by default. This is confirmed by the Microsoft documentation and community consensus, where the highest upvoted comments (e.g., azurecert2021 with 4 upvotes, nmuenter with 3 upvotes) clarify that auth_enabled is specifically for key-based authentication, while token_auth_enabled is for token-based authentication. Although some comments (e.g., phdykd) argue that additional steps like Azure Key Vault are needed, the question only requires enabling key-based authentication, which is achieved with auth_enabled=True. The community vote (80% for A) and detailed reasoning support this as the correct answer.