Based on what we established about the classification of y and using the closure of integers, what does the equation tell yout about the type of nmber y must be for the product to be rational?

Let the closed interval [a , b] be the domain of function f. the domain of f(x - 3) is given by (a) the open interval (a , b) (b) the closed interval [a , b] (c) the closed interval [a - 3 , b - 3] (d) the closed interval [a + 3 , b + 3]