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- 2. Which of the following is NOT a polynomial function?

A. f(x) = x3 - x2 - 10x - 8

C. f(x) = x4 - 4x3 - 7x2 + 22x + 24

B. f(x) = x4 - 6x2 + 3x + 4

D. f(x) = x4 - 9x 3 + 19x2 + 9x - 20 ​