Which of the following is a polynomial?

Answer:DStep-by-step explanation:Terms are separated by addition and subtraction symbols. Polynomials consist of terms that are constant and/or variable. The variable terms must have 0 or positive exponents. Polynomials will not consist of division of variable expressions. Examples of polynomials:[tex]5[/tex][tex]5x[/tex][tex]6-x[/tex][tex]24x^9-x[/tex]Examples of non-polynomials:[tex]\sqrt{x}[/tex][tex]\frac{x+2}{x-4}[/tex]In general a polynomial when written in standard form should be comparable to:[tex]a_nx^n+a_{n-1}x^{n-1}+\cdots a_3x^3+a_2x^2+a_1x+a_0[/tex]where the [tex]a[/tex]'s could be zero and all the exponents,n, are positive or 0.D is comparable since all of these are 0 except [tex]x_4[/tex] which is 1 and [tex]x_0[/tex] which is -2.Also the other choices have either division by variable expressions and/or negative exponents on variables.