**1. Is the standard for both Windows and OSX. You should go with this.**

*Update: (Note that when clicking at extreme bottom of screen it will automatically display as 4,when at extreme right it will display as 3, and at extreme bottom right it displays as 2.)*

This seems to make sense, you right click, and are at the top left position of the list of options. Usually when you get a list, you will want to start from the top.