Andrea argues that (5m−3) (2m+4) models the closure property. What reasoning could Andrea use to argue that multiplication of polynomials is closed?

The terms in the expression are rational numbers and the product is a polynomial
The coefficients of the product are integers and the product is a polynomial
The coefficients of the product are whole numbers and the product is a polynomial
The exponents of the product are whole numbers and the product is a polynomial
The exponents of the product are integers and the product is a polynomial

The exponents of the product are integers and the product is a polynomial.