Which of the following is NOT an accepted means of primary emergency escape?

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When people evacuate a building, the safest and most reliable route is a protected, well-supported path that remains accessible during emergencies. Stairwells are specifically designed as the vertical, protected route for occupants to descend to safety, and exit passageways link rooms or floors to that route. Exit balconies can serve as additional exit options in certain designs, providing alternative egress routes that stay exposed to the outside environment rather than through the interior where smoke and heat spread.

Elevators, on the other hand, are not considered a primary means of emergency escape because they depend on electrical power and system integrity that can fail during a fire. Shifts in heat and smoke can trap cars or block doors, and elevator shafts can act as conduits for heat and smoke, making the cab unsafe or inoperable when it’s most needed. For this reason, codes treat elevators as unsuitable for standard evacuation and reserve them for firefighters or specially equipped temporary use under controlled procedures. Hence, elevators do not fit as the primary escape method, while stairwells, exit passageways, and exit balconies do.