Final answer:
The Android SDK is not part of the Android stack, as it is a set of development tools used for creating applications, not a component of the system stack itself. The stack includes the Linux Kernel, hardware abstraction layer, libraries, runtime, application framework, and the applications.
Step-by-step explanation:
The question asks which of the following is not part of the Android stack: a. Linux, b. Android SDK, c. Dalvik virtual machine (VM), d. Android apps. To provide an answer to this question, let's understand what the Android stack includes. The Android stack is a collection of software layers that make up the operating system for Android devices. These layers include the Linux Kernel, hardware abstraction layer, libraries, Android runtime, application framework, and the applications themselves.
The correct answer to the question is b. Android SDK. The Android SDK, or Software Development Kit, is a set of development tools used by developers to create applications for the Android platform. It is not part of the operating system stack, but rather a set of tools used to develop for the stack.
Linux is the foundational layer of the stack that provides the core system services. The Dalvik virtual machine was the original runtime environment for Android applications, though it has since been replaced by Android Runtime (ART).
Finally, Android apps are what users interact with directly on their devices; these apps sit at the top layer of the Android stack.