A) "same configuration" intends metadata, not data, so a Developer Sandbox would be enough. If the question had some reference to data itself, then Full Sandbox would be the answer.
A Developer sandbox is intended for development and testing in an isolated environment. A Developer Sandbox includes a copy of your production org’s configuration (metadata). https://help.salesforce.com/s/articleView?id=sf.create_test_instance.htm&type=5
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