Question about Emergency Exits (N+ 10-006)

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I came up just a little short on my 10-006 last week (698/720, so close!) and one of the questions I know I got wrong was about emergency exit doors and whether they should be fail-safe, fail-open or fail-closed. I understand the concepts behind the mechanisms, but for an emergency exit, do you still want a fail-closed door for security purposes? Would even a fail closed door still have a manual mechanism allowing people to escape a secure room in case of an emergency, while still keeping the room secure once people have exited? (Like the doors you see at movie theaters, I guess?)

(I went blank during the test and chose fail safe, because, well, safety first. Duh.)

@Rich-Fowler,

From what I understand, Emergency Doors are to be open during business operational hours if they are for fire...this is for quick egress from a building. The way to secure this open access door is to have what you said, a one way lock, in which the door locks behind you automatically. So if this is controlled by another system, let's say by a fire alarm system, those doors should electronically be unbarred when the system loses power if it can bar a human from leaving the building unharmed. Technically, this would be a fail-open system.

Thanks! I was having a hard time trying to figure that one out. The Network+ course has been really informative, too! You guys did a great job with that course.