Consider the following argument. If there are as many rational numbers as there are irrational numbers, then the set of all irrational numbers is infinite. The set of all irrational numbers is infinite. ∴ There are as many rational numbers as there are irrational numbers. Let p = "there are as many rational numbers as there are irrational numbers," and let q = "the set of all irrational numbers is infinite." Is the argument valid or invalid? Select the answer that shows the symbolic form of the argument and justifies your conclusion.