9. Define an application program interface (API) and describe how you used an API in your AWS labs. What is the function or use case for an API? Define messaging and queuing services in AWS and describe how you used this service in your project. What is the function or use case for a message queue? 10. Describe the testing and debugging techniques and tools you used to implement and test your project. What tool did you use to simulate a load test and how did it work? What tool/s did you use to evaluate the results of a load test? What techniques did you use to debug code? 11. Describe the principles of web-scaling and how it achieves the goal of availability. Describe the web components that you built into your web-scale cloud infrastructure (project). Describe the role of component to provide high availability.