Correct answer - "Usage Plans and API Keys" : You can configure usage plans and API keys to allow
customers to access selected APIs at agreed-upon request rates and quotas that meet their
business requirements and budget constraints.
Incorrect:
"AWS Billing" - In billing you can set a spending quota notification but not API consumption
"CloudTrail" - CloudTrail does not set limits instead it is used as an audit tool
"AWS Lambda Custom Authorizers" - Lambda is a separate service than Gateway API therefore it does
not determine its limit