Which of the following is correct?

Which of the following is correct?
1). (4x - 5y)² = 16x² - 20xy + 25y²
2). (4x - 5y)² = 16x² + 40xy - 25y²
3). (4x - 5y)² = 16x² - 40xy + 25y²
4). (4x - 5y)² = 16x² - 20xy - 25y²

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