Community Administrators - is there a better option available where I can get a definitive answer to this question?
Your question is in the right place, at least since it is about Certification, but there may be no people that can actually help you.
By mentioning Cloud Infrastructure Classic the question will appear on that space, so you may also get answers from people that follow that space
Currently the answer is the letter B
The answer is "CPU"
If a bare metal DB system requires more compute node processing power, you can scale up (increase) the number of enabled CPU cores in the system without impacting the availability of that system.