Which OPSEC server is used to prevent users from accessing certain Web sites? 05/30/2017 – by Mod_GuideK 0 Which OPSEC server is used to prevent users from accessing certain Web sites? A. LEA B. URI C. UFP D. AMON E. CVP SHOW ANSWERSCorrect Answer: C Explanation/Reference: Download Printable PDF. VALID exam to help you PASS.