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Answer C is correct because you have to specify which sites you do not want to block pop-up blockers. Answer A is incorrect because you would use the Manage Add-On dialog box to shut down add-on programs such as Adobe Shockwave Flash. Answer B is incorrect because adding to a trusted site allows websites more permissions, such as running ActiveX. Answer D is incorrect because you need to open the Pop-Up Blocker Settings dialog box and add the URL to the allowed sites list.