A company has multiple AWS accounts with applications in the us-west-2 Region. Each account stores application logs in Amazon S3 buckets. The company wants a centralized log analysis solution using a single S3 bucket. Logs must remain in us-west-2, and the solution should incur minimal operational overhead and cost. Which solution meets these requirements and is MOST cost-effective?

S3 Same-Region Replication (SRR) is the most cost-effective and operationally efficient solution. SRR automatically replicates new objects from source S3 buckets to a destination S3 bucket within the same AWS Region (us-west-2 in this case). This ensures logs are centralized with minimal management overhead. An S3 Lifecycle policy is for managing object transitions or expirations within a bucket, not for copying objects between buckets for centralized analysis. A script using PutObject would be complex to manage, prone to errors, and incur significant operational overhead. AWS Lambda functions triggered by s3:ObjectCreated: events would also add operational overhead for development and maintenance, and incur costs for every invocation and data transfer, making it less cost-effective than SRR for continuous log replication.