The product of an odd and an even number is even. The product of two even numbers is even. The product of k and r is odd. According to the statements above, which of the following is a valid conclusion? The product of an odd and an even number is even. The product of two even numbers is even. The product of k and r is odd. According to the statements above, which of the following is a valid conclusion? k is even k can be either even or odd. Both k and r are odd. r can be either even or odd. r is even