This photo, taken by the US Air Force, shows an FBI SWAT team conducting a hijacking exercise at Keesler Air Force Base.

What is the rearmost element doing?

Вариант ответа 1 - a) radioing for reinforcement

Вариант ответа 2 - b) looking over his shoulder

Вариант ответа 3 - c) taking a stride forward

Вариант ответа 4 - d) none of the above