A. The SRX device sends the URL to the SurfControl server in the cloud and the SurfControl server provides the SRX. 
B. The SRX device sends the URL to the SurfControl server in the cloud and the SurfControl server asks the SRX device previously visited.
C. The SRX device looks at its local cache to find the category of the URL.
D. The SRX device does not perform any Web filtering operation as the Web site has already been visited.