Which of the following is NOT a method for terrorists to conceal explosives?

The correct choice indicates that personal computers are not a common method used by terrorists to conceal explosives. Typically, explosives need to be physically hidden on a person or within objects that can be easily carried or transported, which makes items like clothing, briefcases, and shoes suitable options for concealment.

In contrast, while personal computers can house digital devices or data, they are not practical for smuggling or hiding actual explosives. This distinction highlights that traditional methods of concealment focus on physical items that can transport the explosives to the target location. Thus, personal computers do not fit within the context of physically concealing explosive materials in a manner that would be relevant to terrorism tactics.