For this case, we have that by definition, a polynomial in its standard form, is given by:

Where:
a, b, c, d, e,f: They are the coefficients
x: It is the variable
n, n-1,3,2,1,0: They are the exponents. The degree of the polynomial is n, because it is the largest exponent.
So, we have to:

It is given in its standard form.
ANswer:
Option D