According to the Fundamental Theorem of Algebra, which polynomial function has exactly 6 roots? f (x) = 5 x Superscript 4 Baseline 10 x squared 2 f (x) = 5 x Superscript 5 Baseline 3 x Superscript 4 Baseline 12 x cubed 7 x squared minus 2 x 15 f (x) = 6 x Superscript 5 Baseline x cubed minus 4 x squared x minus 5 f (x) = 7 x Superscript 6 Baseline 3 x cubed 12