The method that is best to have when a network goes down is D. Out-of-band management
What is a Network?
This refers to the use of internet protocols to connect to the world wide web that makes use of servers to send and receive packets.
Hence, we can see that when the network is down, it is important to make use of the Out-of-band management because it would give you access to the internet for a while until the network stabilizes.
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