Answer:
The correct answer is letter "C": Dry-pipe sprinklers.
Explanation:
Dry-pipe sprinklers systems use pressurized nitrogen in front of fire emergencies where the closed pipe valves open. Compared to systems using water, for a data center, it will be better to use a dry system like this since computer devices damages will be reduced exponentially or in the worse scenario, there will be higher chances to recover the material on those devices.
