90 points

Factor the following polynomial completely.

- x2y2 + x4 + 9 y2 - 9 x2

( x + 3)( x - 3)( x + y )( x - y )
( x - 3)( x - 3)( x + y )( x - y )
( x + 3)( x + 3)( x + y )( x - y )