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What does the message "If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled" indicate in the context of web development?
A) The resource is not available on the server.
B) The request is blocked due to security reasons related to Cross-Origin Resource Sharing (CORS).
C) The server does not support the 'no-cors' mode.
D) The request was successful but returned no data.