To display the categories of web filtering, which command is appropriate?

The command that is appropriate for displaying the categories of web filtering is "get webfilter categories." This command retrieves the current configuration and status of web filter categories on the firewall, allowing administrators to see the categorization of different URLs and websites that are being filtered. This information is essential for monitoring and managing web traffic on the network, as it directly relates to security policies and user access controls.

The other options, while related to different functionalities, do not pertain to displaying web filter categories. For instance, executing a command related to clearing BGP settings, testing URL filtering applications, or enabling debug mode serves different purposes within the overall management of the firewall and does not specifically provide information about web filtering categories. Therefore, using the appropriate command is crucial for effective firewall management and web security.