You deploy Windows 7 to the computers that are used by your company’s Web developers. All Web developer user accounts are in a single organizational unit （OU）. Internet Explorer is blocking pop-up windows for multiple internal Web applications that are hosted on different servers. You need to use Group Policy to ensure that Internet Explorer does not block pop-up windows for internal Web applications. What should you do？（）

Add each server to the Intranet zone.
B. Add each server to the Trusted Sites zone.
C. Enable Compatibility View in Internet Explorer.
D. Set the default security setting in Internet Explorer to Medium.