For Mobile application development. Thumbs up for right answers. Thanks!

A Spinner in Android is basically which of the following: Select one: O a. a graphic that indicates that the app is currently busy processing a request b. a drop-down list of values that allows a single value to be chosen from a selection C. a graphic element that can be used to generate a random value from a set of values O d. no such thing exists in Android What code would specify a vertical LinearLayout: Select one: O a. android:layout="vertical" b. android:vertical="true" C. android:linerlayout="vertical" O O d. android:orientation="vertical" Which of the following would be a valid method that could be called by a button press in an app: Select one: a. public static void onClick(View view) O O O b. public void onClick(View view) c.public void onClick(Button button) d. public void onClick()