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