Investigations involving the preservation, identification, extraction, documentation, and interpretation of computer media for evidentiary and root cause analysis are known as

The correct answer to the following question will be "Digital Forensics".

Explanation:

Digital forensics is a field of forensics that involves the analysis and retrieval of materials found in electronic devices, sometimes related to cybercrime.The objective of digital forensics methodologies would be to check, maintain and evaluate evidence on computing systems to find possible evidence for a trial. In the initial days of computing, an individual investigator could process files because the power consumption was so small.

Therefore, Digital Forensic is the right answer.