What does URL Filtering primarily focus on?

The correct answer is C. URL Filtering primarily controls access to websites based on URLs, URL categories, and site classification. Administrators use it to allow business-relevant sites, block malicious or inappropriate categories, warn or inform users, and enforce acceptable-use policy. Option A is wrong because user credentials are handled through Identity Awareness, authentication infrastructure, or directory services, not URL Filtering. Option B is wrong because URL Filtering does not mean blocking all HTTP traffic; it applies selective policy based on site/category criteria. Option D is wrong because encryption of web traffic is provided by HTTPS/TLS and VPN technologies, not URL Filtering. URL Filtering becomes especially important because websites are often business-critical and risk-bearing at the same time; policy must distinguish between allowed sites, unacceptable categories, and dangerous destinations rather than treating all web traffic alike. Reference topics: URL Filtering, URL categories, website access control, Application and URL Filtering rules.