When you encounter the error message "Access to fetch at 'URL' from origin 'ORIGIN' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource," what is the primary issue?
A) The server is not responding to the request
B) The server is not including the correct CORS headers in its response
C) The request URL is incorrect
D) The browser is blocking cookies from being sent