Which type of ferromagnetic detector is best suited for full-body screening?

The best option for full-body screening in the context of ferromagnetic detectors is indeed a more effective choice than simply declaring that none of the listed types meet the requirements.

Full-body screening typically requires a system that can effectively scan large areas of a person's body to ensure comprehensive detection of ferromagnetic objects. Pillar detectors and doorway detectors are designed for large areas, but they often serve specific purposes and may not provide complete coverage or detailed scanning of individual body parts.

Handheld detectors, while versatile, require the operator to actively scan each individual, which could lead to missed items or inconsistencies in scanning, especially in busy environments.

Ultimately, the appropriate technology for full-body screening would likely involve a system designed specifically for that purpose, combining the capabilities of the detectors mentioned into a more integrated solution or system that can provide thorough scanning. This understanding of the limitations and roles of different detectors highlights why a more comprehensive or specialized system would be necessary for effective screening.