Let f(x) and g(x) be polynomials as shown below.
f(x)= a0 + a1x + a2x^2 ... + anx^n
g(x)= b0 + b1x + b2x^2 ... + bmx^m

Which of the following is true about f(x) and g(x)?
A.
f(x) and g(x) are closed under subtraction because when subtracted, the result will not be a polynomial.
B.
f(x) and g(x) are not closed under subtraction because when subtracted, the result will be a polynomial.
C.
f(x) and g(x) are not closed under subtraction because when subtracted, the result will not be a polynomial.
D.
f(x) and g(x) are closed under subtraction because when subtracted, the result will be a polynomial.