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4. Which of the following is a polynomial function in standard form?
A. f(x) = x4-3x2+2x3-4x+5
B. f(x) = -3x2+x3+4
C. f(x) = 2x4-6x3 + x2-4x+25
D. f(x) = -3x2+x3+4 + 3 x​