You are developing a RESTful API. When a client sends a POST request to create a new resource, but the resource already exists, which HTTP status code should your API return to best adhere to standard practices?
400 Bad Request
500 Internal Server Error
202 Accepted
409 Conflict
According to standard HTTP status code definitions, 409 Conflict is the appropriate response when a request conflicts with the current state of the server, such as trying to create a resource that already exists. A 400 Bad Request implies general client errors, 202 Accepted is used when a request has been accepted for processing but the process has not been completed, and 500 Internal Server Error indicates a server error, not a conflict of resource state.
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