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what is the standard of the polynomial expression x⁴+8x²-5x²-2+15x? A.x⁴+8x²-5x³+15x-2
B.x⁴-5x³+8x²-2+15x
C.x⁴-5x³+8x²+15x-2
D.x⁴+8x²-5x³-2+15x ​