Which of the following is not an Android component (i.e. a point from which the system can enter your application)?

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Which of the following is not an Android component (i.e. a point from which the system can enter your application)?
A . Service
B . Activity
C . Layout
D . Content Provider

Answer: C

Explanation:

Here are the four types of app components: Activities, Services, Content providers, and Broadcast receivers.

References: http://developer.android.com/guide/components/fundamentals.html