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Question:

What should he use to put out the fire in the following situation?
You see smoke coming from a server after hearing the fire alarm at work in the network room. When you shout out and beg him to stop, one of your coworkers is already attempting to pacify it with a bucket of water.

A a class C fire extinguisher
Explaination

You should always use special dry fire prevention or extinguishing chemicals for electrical fires such as carbon dioxide