You want to view a folder of pictures from an external hard disk drive in your Windows 7 Pictures library. What should you do?

Windows 7 Libraries aggregate content from various physical locations into a single logical view; you can right-click a folder on your external drive in Windows Explorer and select 'Include in Library' then 'Pictures Library' to add it.

The Network and Sharing Center is used for managing network connections and sharing settings, not for adding local folders to a library.

Accessing pictures via a shared folder refers to network sharing, not specifically integrating an external drive's content into a Windows library.

Enabling password-protected sharing is a network security setting that does not relate to adding local folders from an external drive to a Windows library.