Which of the following is true about the Cisco IOS-IPS functionality？ （）

• A、 The signatures available are built into the IOS code.
• B、 Toupdate signatures youneed to install a new IOS image
• C、 To activate new signatures you download a new Signature DefiitionFile （SDF） from Cisco’s web site
• D、 Loading and enabling selected IPS signatures is user configurable
• E、 Cisco IOS onlyprovides Intrusion Detection functionality
• F、 Cisco IOS-IPS requires a network module installed in your router running sensor software