Which of the following is a crucial step in the digital forensic investigation methodology?

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The question asks which step is crucial in the digital forensic investigation methodology. 
Option a: Documenting the chain of custody. This is fundamental in digital forensics because it ensures that evidence has been collected, transferred, and stored in a manner that preserves its integrity and admissibility in court. Proper chain of custody prevents contamination, tampering, or questions about authenticity.
Option b: Analyzing DNA samples. While vital in biological or forensic contexts, DNA analysis is not a standard part of digital forensics, which focuses on digital devices, data, and artifacts rather than biological evidence.
Option c: Conducting witness interviews. While interviews can support a broader investigation, they are not a core procedural step within the digital forensic methodology itself, which concentrates on data preservation, imaging, analysis, and documentation.
Option d: Collecting physical evidence. In digital forensics, the emphasis is on digital evidence from devices and digital artifacts. Collecting physical items may be relevant in some cases but is not a defining step of the digital forensic process itself.

Introduction to Security and Forensic Technologies (CT046-3-1-ISFT-25-RESIT)

Which of the following is a crucial step in the digital forensic investigation methodology?

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