which statement shows two polynomials 4x+6 and 2x^2-8x demonstrating the closure property when multiplied?
a.)8x^3-20x^2-48x is a polynomial
b.)8x^3+20x^2+48x may or may not be a polynomial
c.)8x^2-32x^2-14x is a polynomial
d.)8x^2+32x^2+14x may or may not be a polynomial