Okay, let me see here. Discarding traffic to a specific IP address - that sounds like it could be a security measure. I'll need to make sure I understand the expected behavior.
This looks like a security question. Option A seems risky - you definitely don't want vendors having full author access. I'd choose D for a dedicated preview environment.
This seems like a straightforward access control question. I think the answer is B - restricting the file write permissions to the development group only.
Gilberto
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