Option D. Physical acquisition is the best answer because the question asks for the method that provides the most extensive access to Android device data, including existing data, deleted data, and system-level files .
CHFI v11 explicitly covers Data Acquisition Methods , Mobile Phone Evidence Analysis , Android and iOS Forensic Analysis , and both Logical Acquisition of Android and iOS Devices and Physical Acquisition of Android and iOS Devices .
A physical acquisition captures the raw contents of device storage at a lower level than logical or file-system- only approaches. Because of that, it offers the best chance of recovering deleted artifacts and examining system areas that are not normally exposed through higher-level acquisition methods. This makes it the most comprehensive choice when the goal is to maximize evidentiary coverage.
Logical acquisition is more limited and generally focuses on accessible user data. File system acquisition can be broader than logical collection, but it still does not usually provide the same depth as a full physical image. Cloud acquisition may complement the investigation, but it does not replace direct device acquisition.
Therefore, under CHFI mobile-forensics objectives, physical acquisition is the strongest answer.