How is the expression (3 + y) ⋅ 7 described by its factors and terms? a: it has two factors and the factor (3 + y) has one term. b: it has three factors and the factor (3 + y) has one term. c: it has two factors and the factor (3 + y) has two terms. d: it has three factors and the factor (3 + y) has two terms.