Explanation
Drive encryption is a form of encryption that best achieves the goal of data-at-rest encryption for all data.
Drive encryption encrypts the entire hard drive, including the operating system, applications, and files. This prevents unauthorized access to the data if the drive is lost or stolen. Database, folder, and file encryption are forms of encryption that only encrypt specific data sets, not all data. References: [CompTIA Server+ Certification Exam Objectives], Domain 5.0: Security, Objective 5.3: Given a scenario involving a security threat/vulnerability/risk, implement appropriate mitigation techniques.