Android menu definitions explaination

What are the diff开发者_开发问答erences between the following types of menus in Android?

1. option menu
2. context menu
3. sub menu

Can anyone give me an explanation and an example for each?

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1. Option menu: The menu that appears when you press the menu button
2. Context menu: The menu that appears like a dialog with a list when you (mostly) longpress on list elements
3. Sub menu: can be used to display more menu items with your option menu.

More details: http://developer.android.com/guide/topics/ui/menus.html