Which aspect of API management is maintained by using policies?

The correct aspect of API management that is maintained by using policies is security and compliance. Policies are instrumental in enforcing security measures like authentication, authorization, and data encryption on APIs. They help ensure that only authorized users can access certain endpoints and that data is transmitted securely, complying with regulatory standards and best practices.

Additionally, policies can enforce compliance measures by applying rules that govern how data should be handled, ensuring that APIs adhere to industry regulations. By deploying policies, organizations can maintain a high level of security around their APIs and ensure compliance with laws such as GDPR or HIPAA.

While logging and analytics contribute valuable insights into API performance and usage, they do not inherently involve policy management. Routing and transformation pertain more to how API requests and responses are processed rather than the management of compliance or security aspects. Version control is focused on managing different iterations of the API, which is separate from the enforcement of policies related to security and compliance.