When configuring the URL filtering configuration file, www.bt.com is configured in the URL blacklist-item:
At the same time, set it in the custom URL category.
A URL is set as bt.com, and the action of customizing URL classification is a warning. Regarding the above configuration, which of the following statements are correct? (More select)

Anti DDoS seven-layer defense can work from the dimensions of interface-based defense, global defense and defense object-based defense.

Since the sandbox can provide a virtual execution environment to detect files in the network, the sandbox can be substituted when deploying security equipment Anti-Virus, IPS, spam detection and other equipment.