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A leading digital payments company uses AWS to host its web application suite, which uses external APIs for credit and debit transactions. The current architecture is using AWS CloudTrail with several trails to log all API actions. Each trail is protected with an IAM policy to restrict access from unauthorized users. In order to maintain the system's PCI DSS compliance, a solution must be implemented that allows the tracing of the integrity of each file and prevents the files from being tampered with. Which of the following is the MOST suitable solution with the LEAST amount of effort to implement?