Which of these provide centralized reporting for the S-Series？（）

A.avoid mentioning the upgrade to the customer
B.schedule a convenient time to upgrade again， backing up the configuration before and after theupgrade
C.contact customer support and ask them to run the upgrade for you
D.immediately show the customer how to run the CLI command upgrade

A.wccp debug enable
B.tailproxylogs
C.tailaccesslogs
D.showswccp

A.scanning streaming media for malware
B.scanning multiple downloads at the same time
C.passing pieces of a download to the client while the download is being scanned
D.passing scanned pieces of the file between two different malware-scanning engines