When configuring URL filtering with the Trend Micro filtering service. Which of these steps must
you take to prepare for configuration?

A.
define blacklists and whitelists

B.
categorize traffic types

C.
install the appropriate root CA certificate on the router

D.
synchronize clocks via NTP to ensure accuracy of URL filter updates from the service

Explanation:
http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6643/white_paper_c89-492776.pdf