1. Imagine that there's been a train wreck and a plume of toxic gas is released. You're the security manager for a high-rise office building nearby. What should you instruct the employees to do? A. Find a windowless room on an upper floor, away from the plume, and shelter in place. B. Gather in the first-floor lobby and await further instructions. C. Go to the nearest designated area of refuge, whichever side of the building it's on, and stay there. D. Make sure the HVAC is turned off and then go about business as usual.