A business administrator wants to prevent employees from accessing shopping websites during business hours. A URL filtering configuration file was then configured to select the shopping site in the predefined category as blocked. However, employee A can still use the company's network to shop online during the lunch break.
What are the possible reasons for the following? (Multiple choices)

The cloud sandbox refers to deploying the sandbox to the cloud and providing tenants with remote detection services. The process includes:
1. Report suspicious files
2. Backtracking attacks
3. Firewall defense linkage
4. Cloud sandbox detection
Which of the following option is correct for the sorting of this process?

After the Huawei USG6000 product license expires, the RBL function is unavailable.
Users can only use local black and white lists to filter spam.

An enterprise administrator configures the Web reputation system as shown in the figure.
Which of the following statements is true about this configuration?

For compressed files, the virus detection system can directly detect.