A system administrator has been tasked with securing data at rest for a company's document storage server, ensuring maximum confidentiality. Which of the following solutions would be the MOST appropriate to accomplish this task?
Implement full disk encryption on the document storage server drive.
Encrypt each document individually with a unique key.
Ensure Secure Socket Layer (SSL)/Transport Layer Security (TLS) is enabled on the server.
Utilize a VPN with robust encryption for accessing documents remotely.