Which of the following water sprinkler systems sounds an alarm and delays water release?

A.
Wet pipe system

B.
Preaction system

C.
Deluge system

D.
Dry pipe system

Explanation:
Preaction systems release water into the pipes after a certain
temperature is met and then delay the release until a link mechanism melts. These
systems are the most popular for data processing environments because it gives
people time to put the fire out themselves, if it is small enough. This is good
because releasing water into a data processing environment can be damaging to the
computers. It also allows people to react and turn the system off if it is a false
alarm.