Which of the following describes a proxy server's filtering capability?

The description of a proxy server’s filtering capability accurately highlights that it can enforce blacklists and whitelists for web access. This means that a proxy server can control which websites users can access based on predefined rules. Blacklists contain URLs or IP addresses that are blocked, meaning users cannot access them, while whitelists include those that are permitted. This ability is crucial for organizations that need to manage and secure their network traffic effectively, preventing access to harmful or inappropriate websites and ensuring compliance with corporate policies.

In contrast, caching frequently accessed webpages, blocking all internet requests, or directly connecting clients to the internet without restrictions do not encompass the full functional capability of filtering that a proxy server provides. Caching focuses on improving load times and bandwidth efficiency rather than access control. Blocking all requests or allowing unrestricted connections indicates a lack of any filtering capability, which does not align with the primary function of a proxy server in managing web access.