What is a benefit of using Cisco CWS compared to an on-premises Cisco WSA?

What is a benefit of using Cisco CWS compared to an on-premises Cisco WSA?
A. Cisco CWS eliminates the need to backhaul traffic through headquarters for remote workers whereas Cisco WSA does not
B. Cisco CWS minimizes the load on the internal network and security infrastructure as compared to Cisco WSA.
C. URL categories are updated more frequently on Cisco CWS than they are on Cisco WSA
D. Content scanning for SAAS cloud applications is available through Cisco CWS and not available through Cisco WSA

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