Let f(x) and g(x) be polynomials as shown below.

which of the following is true about f(x) and g(x)?
a.
f(x) and g(x) are closed under addition because when added, the result will not be a polynomial.
b.
f(x) and g(x) are not closed under addition because when added, the result will not be a polynomial.
c.
f(x) and g(x) are not closed under addition because when added, the result will be a polynomial.
d.
f(x) and g(x) are closed under addition because when added, the result will be a polynomia