下面哪一个是正确的 MongoDB JSON document 格式__?
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- A、{}
- B、{ "user_id"=1, "user_name"="Joe Sanders", "occupation"=["engineer","writer"] }
- C、{ "user_id":1; "user_name":"Joe Sanders"; "occupation":["engineer","writer"] }
- D、{ "user_id":1, "user_name":"Joe Sanders", "occupation": [ "occupation1":"engineer", "occupation2":"writer" ] }
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