Final answer:
The directory for storing the info file for an app widget is 'res/xml' for Android and defined within the Info.plist in the widget extension directory for iOS. The exact location may vary based on the development environment.
Step-by-step explanation:
The directory you should use to store the info file for an app widget depends on the operating system and development environment you are working with. Generally, for Android app widgets, the info file is an XML resource that should be placed in the 'res/xml' directory of your Android project. This XML file, typically named 'widget_info.xml', contains metadata about the widget, such as the update frequency, initial layout, and more.
For iOS app widgets, the information is defined in the widget extension's 'Info.plist' file. This file is located within the widget extension's directory, which can be found inside the Xcode project's navigator pane.
In other development environments or for different types of widgets, the location and name of the info file might vary, but typically it will be stored within a directory designated for configuration files or resources specific to widgets.