What does the error message "No 'Access-Control-Allow-Origin' header is present on the requested resource" typically indicate?
A) The server is not allowing the requested resource to be accessed due to security settings related to Cross-Origin Resource Sharing (CORS).
B) The server has successfully included the 'Access-Control-Allow-Origin' header, but the request is not using HTTPS.
C) The client is requesting a resource that does not exist on the server.
D) The server is experiencing high traffic and cannot fulfill the request at the moment.