An ad-tech company runs a leading ad targeting platform that captures various kinds of marketing data such as user profiles, user events, clicks, and visited links. The company is looking to migrate its IT infrastructure from the on-premises data center to AWS Cloud. The technical requirements for the advertising platform mandate a high request rate (millions of requests per second), low predictable latency, and high reliability. The company also needs to deploy this ad-targeting platform in more than one AWS Region. The maximum size of an event is 200 KB and the average size is 10 KB. The structure of the incoming data varies depending on the event. Which of the following database solutions would you recommend to address these requirements?