The correct answer is B. For web-browsing rules in Application Control and URL Filtering, the relevant service in the available answer set is HTTP. DNS is used for domain-name resolution, not web browsing itself. FTP is used for file transfer, and SMTP is used for email transmission. In actual policy design, administrators commonly consider both HTTP and HTTPS traffic because modern web browsing is overwhelmingly encrypted, and HTTPS Inspection may be needed for full visibility. However, among the four listed services, HTTP is the correct web-browsing service. The important CCSA principle is that Application Control and URL Filtering rules are placed in Access Control layers where application/site objects and service conditions determine matching. Using the wrong service object can cause the rule not to match the intended web traffic. Reference topics: Application Control, URL Filtering, Services & Applications column, web-browsing rule design.
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