单项选择题
A. file type B. file size C. file age D. file name
A. custom URL categories cannot contain IP addresses B. custom URL categories cannot override predefined URL categories C. custom URL categories can contain domain names D. custom URL categories can use regular expressions
A. show them independent tests and reviews B. describe the theory of operation and system internals C. give a Microsoft PowerPoint presentation D. give a demonstration that could lead to an evaluation