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Which algebraic expression is a polynomial with a degree of 5?
3x5 + 8x^y2 – 9x2y3 - 6y5
2xy^ + 4x2y3 - 6x3y2 - 7x4
8y + y5 – 5xy2 + 7x?y? – x3y - 6x4
6xy5 + 5x?y3 – x3y2 + 2x²y3 – 3xy5
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