You need to remove any Microsoft Windows Internet Explorer 7 add-ons in Microsoft Windows Vista computers that do not have prior approval from the following authorities： Microsoft  System manufacturer  Service provider What should you do？ （）

• A、Remove any add-ons that are not found in the list of downloaded ActiveX controls.
• B、Remove any add-ons that are not found in the list of add-ons used by Windows Internet Explorer 7.
• C、Remove any add-ons that are not found in the list of add-ons that run without requiring permission.
• D、Remove any add-ons that are not found in the list of add-ons that are at present loaded in Windows Internet Explorer 7.