According to the Fundamental Theorem of Algebra, which polynomial function has exactly 6 roots?
A
f of x is equal to 7 x to the 6th power plus 3 x cubed plus 12B
f of x is equal to 5 x to the 5th power plus 3 x to the 4th power plus 12 x cubed plus 7 x squared minus 2 x plus 15C
f of x is equal to 5 x to the 4th power plus 10 x squared plus 2D
f of x is equal to 6 x to the 5th power plus x cubed minus 4 x squared plus x minus 5