Ashad is rewriting the expression 28 a + 36 a b as a product. Which statements about the expression are accurate and relevant to his rewriting the expression? Select three options. The GCF of the numbers in each term in the expression is 2. The GCF of the numbers in each term in the expression is 4. The GCF of the variables in each term in the expression is a. The factored form of the expression is 2 a (14 a + 18 a b). The factored form of the expression is 4 a (7 + 9 b)