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Answer:
Option B i.e., Circuit level gateways only enable data to be inserted into a network which is the product of system requests within the network.
Explanation:
In the above question, some details are missing in the question that is options.
Option B is valid because Circuit level gateways are not the transmission inspection, always require information into such a server resulting through system appeal inside the server through maintaining a record for connections that are sent into the server and only enabling information in this is in answer to such queries.
Other options are incorrect because they are not true according to the following scenario.
You might need to change the Boot order to be able to boot to a USB stick.
On older machines, there might be an interrupt problem with a new sound/video card that needs to be resolved.
You might need to reset all settings to the default settings due to unexpected results.
Some BIOS allow you to overclock your CPU and the might need to be changed back due to system instability.
