Final answer:
A terrorist is most likely to use a secondary explosive device to harm first responders and maximize public attention, inflicting physical destruction alongside lasting psychological impact.
Step-by-step explanation:
A terrorist would MOST likely use a secondary explosive device to injure rescuers and gain maximum public attention. This tactic is intended to create additional chaos and fear after the initial explosion, targeting first responders and further traumatizing the affected population. The use of a secondary explosive device in such a manner is seen as a means to exacerbate the situation, ensuring that the attack's impact is not only physically destroyed but also has a lingering psychological effect.