Option A is correct because CHFI v11 gives strong importance to legal and ethical handling of evidence , especially in contexts where data may contain personal or sensitive information. The blueprint explicitly includes seeking consent , best practices for handling digital evidence , legal issues, privacy issues and legal compliance , preserving evidence , and chain of custody . These requirements apply directly to mobile devices, which often contain highly private data and therefore demand careful lawful handling.

Obtaining permission from the device owner , or otherwise ensuring proper legal authority, is foundational to admissibility and professional forensic practice. Just as important, the evidence collection process must comply with applicable regulations and be documented properly. CHFI also covers the mobile forensics process and stresses that sound forensic work requires procedure, documentation, and defensible evidence handling.

Option B may sometimes be operationally useful, but failing to document the action is a major forensic weakness. Option C ignores tool suitability and legal compliance. Option D directly undermines admissibility because undocumented collection damages evidentiary credibility. Therefore, the most CHFI-aligned and legally defensible response is to obtain permission and ensure the process complies with relevant legal requirements.