21. Which of the following statements is true concerning the control activators, i.e., pull-handles, push- buttons or levers, for a space protected by a CO2 fixed fire extinguishing system?

Two control activators are required when a stop valve is installed in the main discharge line to a space.
Only one control activator is required for discharge piping systems designed without a stop valve.
An alarm must sound for at least 20 seconds before CO2 is released into a space that is likely to be occupied.
All of the above

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