Exam 312-49v10 topic 1 question 571 discussion

Shield workstations from transmitting electromagnetic signals, which is common with electronic equipment. The solution is to shield emissions through a process the US Department of Defense has named TEMPEST. TEMPEST stands for “Telecommunications Electronics Materials Protected from Emanating Spurious Transmissions”

To prevent eavesdropping, TEMPEST labs use sheets of metal, good conductors such as copper for lining the walls, ceilings, and floor. Insulate the power cables to prevent radiation and add filters to the telephones within the lab. It is costly to build a TEMPEST lab, as it goes through checks and maintenance at regular intervals. As a replacement for a TEMPEST lab, some vendors have come up with low-radiation workstations. The cost of such kinds of workstations is more than the normal forensics workstation.

The main purpose of lining the walls, ceilings, and floor with copper in a forensic lab is to avoid electromagnetic emanations. Copper is a non-magnetic metal that does not interfere with the operation of electronic equipment and is used to shield against electromagnetic interference (EMI) and radio frequency interference (RFI). This helps to maintain the integrity of digital evidence and ensure that data collected from digital devices is not contaminated

C. CHFI v10 page 77: shield workstations from transmitting electromagnetic signals… such as copper…

I think it's the right answer because the question is related to TEMPEST initiative, not Faraday's cage.

https://mriquestions.com/why-rf-shielding.html