A company needs to migrate 100 GB of historical data from on premises to an Amazon S3 bucket. The on-premises site has a 100 megabits per second (Mbps) internet connection. Data must be encrypted in transit. New data will be written directly to Amazon S3. Which solution meets these requirements with the LEAST operational overhead?

AWS DataSync is the most suitable solution for this scenario due to its fully managed nature, which minimizes operational overhead. It efficiently and securely transfers data over the internet, handling encryption in transit automatically. DataSync is optimized for large-scale migrations and can accelerate transfers, making it ideal for 100 GB of historical data. The s3 sync command in the AWS CLI is a viable option for smaller, less critical transfers but lacks the built-in optimization, monitoring, and error handling of DataSync, increasing operational overhead for a 100 GB migration. AWS Snowball is designed for petabyte-scale data transfers where internet bandwidth is a significant bottleneck, making it overkill and more operationally complex for 100 GB. Setting up an IPsec VPN adds significant operational overhead for configuration and management, and while s3 cp can transfer data, it doesn't offer the same level of optimization and features as DataSync.