Which of the following is correct about adding permissions to your application to use in-app billing? 

Add <uses-permission android:name=""com.android.vending.BILLING""/> to every layout resource in your application. 

Add <uses-permission android:name=""com.android.vending.BILLING""/> to AndroidManifest.xml. 

Add <uses-permission android:name="com.android.billing.inapp"/> to AndroidManifext.xml 

Add <uses-permission android:name="com.android.billing.inapp"/> to every layout resource in your applicaiton.