The correct answer is D. Application Control and URL Filtering commonly operate using a Negative Control Model, also known as a blacklist model. In this approach, administrators block or restrict known unwanted applications, application categories, URL categories, or risky behavior while allowing other traffic that is not explicitly blocked. Content Awareness can also be used to apply controls based on data types or content patterns within Access Control policy. Option C describes the Positive Control Model, which is more typical of firewall Access Control where only explicitly approved traffic is permitted and cleanup drops the rest. Option A uses “permissive” but incorrectly equates it with whitelist. Option B is close in plain English, but the official exam terminology uses Negative Control Model, not “Restrictive Control Model,” as the matched answer. The operational distinction matters because blacklist models depend heavily on accurate categorization, signatures, and ongoing updates. Reference topics: Application Control and URL Filtering, Content Awareness, control models, category-based blocking.