Question: A viewport is a rectangular area of the display window. By default, it is the entire window, but it can be set to any smaller

A viewport is a rectangular area of the display window. By default, it is the entire window, but it can be set to any smaller size in pixels via the function gl.viewport. In following function call, what is the coordinate of the right lower corner of the view port?
gl.viewport(1,2,3,4);
(1,2)
(2,3)
(3,4)
(4,2)

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