Multiple development teams need to publish an API using API Gateway before the backend is ready so dependent teams can continue work. The API should return mocked responses and HTTP status codes without an integrated backend. Which solution satisfies this requirement?

The MOCK integration type in API Gateway is specifically designed for scenarios where you need to simulate API responses without a backend. This allows dependent teams to proceed with development using predefined responses and status codes. You configure the integration request and response to define the mock data and HTTP status codes. Using a Lambda function (AWSPROXY) or an EC2-based application (AWS) would introduce unnecessary compute resources and complexity for a simple mocking requirement. While these could technically return mocked responses, they are overkill and not the most efficient solution. HTTPPROXY is for integrating with existing HTTP endpoints and doesn't directly support built-in mocking with mapping templates in the way described for a Lambda layer.