Which of the following expressions is a polynomial?
Af(x)=4/x-11x^2
B4x^3-13x^2+5x
C5x^3+7x^4-1/2x
D-3x^4+8x^2-2√x+1
...?
Af(x)=4/x-11x^2
B4x^3-13x^2+5x
C5x^3+7x^4-1/2x
D-3x^4+8x^2-2√x+1
