Which of the following is correct?

Which of the following is correct?
1). (3x + 4y)(4x- 3y)= 12x2 + 7xy 12y2
2). (3x + 4y)(4x- 3y)= 12x2 + 7xy 9y2
3). (3x + 4y)(4x- 3y)= 12x2 + 8xy 12y2
4). (3x + 7y)(4x- 3y)= 12x2 + 7xy 12y2

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