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In a serverless multi-tier application development on AWS using Amazon API Gateway and AWS Lambda, what is the least effort solution for a frontend developer to create integration tests covering both positive and negative HTTP status code scenarios?
A
Mock API methods in API Gateway, configure method's integration request and response to simulate success or error status codes with corresponding messages.
B
Utilize two mock integration resources in API Gateway, one for success and one for error status codes, with appropriate messages for each.
C
Develop Lambda functions for testing, integrate with API Gateway, and select functions based on the required HTTP status codes for success or error.
D
Develop a single Lambda function for testing, create a mock integration in API Gateway, and use the function to simulate both success and error status codes.
