Which HTTP status code indicates a successful request?

• A. 400
• B. 200
• C. 404
• D. 500

Answer: (B)

The status code that indicates a successful request is 200. This code signifies that the server has successfully processed the client's request and that the requested resource is available and has been returned in the response. In the context of web development and API design, a 200 code is often the primary indicator for successful interactions, whether for retrieving data (like using a GET request) or confirming that a resource has been updated (with POST or PUT requests).

In contrast, the other status codes represent various error conditions, such as 400, which indicates a bad request due to malformed syntax; 404, which signifies that the requested resource is not found on the server; and 500, which indicates an internal server error, meaning something went wrong on the server side while processing the request. Each of these codes reflects different types of issues that prevent the server from fulfilling a request successfully.