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

What should the team members watch out for?

Вариант ответа 1 - a) chain on the ground

Вариант ответа 2 - b) sniper at the window

Вариант ответа 3 - c) moving fire truck

Вариант ответа 4 - d) unexploded ordnance