A company stores 700 terabytes on a large NAS system in its corporate data center and has a 10 Gbps AWS Direct Connect. After a regulatory audit, the company has 90 days to move the data to the cloud. The company must move the data efficiently without disrupting access and must be able to access and update the data during the transfer window. Which solution meets these requirements?

AWS DataSync is the most suitable solution. It is designed for large-scale data transfers (hundreds of terabytes to petabytes) over Direct Connect or VPN, making it efficient for 700 TB. DataSync agents installed on-premises can transfer data to Amazon S3, Amazon EFS, or Amazon FSx for Windows File Server. It offers features like automatic encryption, data integrity validation, and network optimization, ensuring efficient and reliable transfer. Crucially, DataSync allows continued access and updates to the source data during the transfer, meeting the requirement for non-disruptive access. Snowball Edge is incorrect because while it handles large data, it's primarily for offline transfers where shipping devices is acceptable. The requirement for accessing and updating data during the transfer makes an online solution like DataSync preferable. rsync is a basic utility and would lack the optimization, resilience, and management features of DataSync for such a large and critical transfer, potentially leading to disruption or extended transfer times. Tapes are an offline solution and would not allow data access during transfer.