Which aspect of an API Manager allows you to enforce usage limits?

The aspect of an API Manager that allows you to enforce usage limits is through Policy Enforcement. Policies can be applied to APIs to control and monitor their usage and behavior. By implementing rate limiting or throttling policies, organizations can restrict the number of requests made to an API within a specified time frame, ensuring that no user can consume excessive resources. This is crucial for protecting backend systems from overload, ensuring fair usage among consumers, and helping organizations maintain control over their API traffic.

While Access Control Settings focus on permissions and access levels, and Monitoring Metrics provides insights into the API usage patterns, they do not specifically enforce limits on how much an API can be used. API Design Specifications outline the structure and behavior of APIs, but they do not include enforcement mechanisms related to usage limits. Hence, the correct option for enforcing usage limits in an API Manager is through Policy Enforcement.