A forensic investigator has been assigned to extract data from several IoT devices involved in...

Option D. MD-NEXT is the best answer because the question is specifically about a forensic tool suitable for collecting evidence from multiple IoT device types while supporting broad extraction needs. CHFI v11 includes IoT forensics , evidence extraction from embedded and smart devices , and understanding the methods used to acquire and analyze data from nontraditional digital systems. In that context, the correct choice is the tool that is actually designed for device-level forensic extraction rather than one intended for unrelated analytical or cloud-focused purposes.

The other options are less appropriate. Freta is associated with cloud-scale memory analysis concepts rather than hands-on IoT extraction. Gephi is a graph visualization and network-analysis tool, not a forensic acquisition platform. Promqry is not the established choice for this type of physical and logical evidence extraction scenario. MD-NEXT , by contrast, fits the role of a specialized forensic solution for handling diverse devices and collecting evidence in a structured manner.

Because the scenario emphasizes variety of IoT devices , forensic extraction , and the need not to miss evidence, the most suitable CHFI-aligned answer is MD-NEXT .