Which item is correct regarding Cisco IOS IPS on Cisco IOS Release 12.4（11）T and later ？（）

• A、requires the Basic or Advanced Signature Definition File
• B、uses the built-in signatures that come with the Cisco IOS image as backup
• C、supports SDEE，SYSLOG，and SNMP for sending Cisco IPS alerts
• D、uses Cisco IPS 5.x signature format