B. Using the Compatibility Pack
The compatibility pack, or support library, is a set of classes that have been provided to add support to legacy versions of Android (the minimum API level supported is 4).
Android Support Packages
The support library adds the following packages:
android.support.v4.accessibilityservice
android.support.v4.app
android.support.v4.content
android.support.v4.content.pm
android.support.v4.database
android.support.v4.net ...
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