I remember practicing a question about recommending actions to increase solution value, but I can't recall if it was specifically in this knowledge area.
I feel pretty confident about this one. The question is really getting at the core principles of service-oriented architecture - reusability and adaptability. I'd go with option C and try to identify existing services that can be reused, rather than rebuilding everything. That's the most pragmatic approach in my opinion.
Consensus methods are all about security, right? I'm pretty sure they ensure 51% of the nodes agree on a transaction before it's recorded. That seems like the highest level of security for a database.
This looks like a straightforward question about file permissions. I'll review the options carefully and go with the one that best matches the description.
I think I've heard of a sheepdip before, but I can't quite remember what it is. I'll have to eliminate the options that don't make sense and see if I can narrow it down.
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