How do you display the Action Bar back button on all Android versions?

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Question:How do you display the Action Bar back button on all Android versions?

1.getSupportActionBar().setDisplayBackButton(true);

2.getActionBar().setDisplayHomeAsUpEnabled(true);

3.getSupportActionBar().setDisplayHomeAsUpEnabled(true);

4.None of the above

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  1. How do you display the Action Bar back button on all Android versions?
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