When a fire occurs in the cabinet and the fire extinguishing device releases the extinguishing agent into the protection zone, what will display the words “Don’t let in”.

When a fire occurs in the cabinet and the fire extinguishing device releases the extinguishing agent into the protection zone, what will display the words “Don’t let in”.
A . Fire alarm bell
B . Sound and light alarm
C . Venting indicator
D . Emergency light

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Answer: C