Final answer:
The expression in product-of-sums form is (A + B) (C + D). It represents the multiplication of two sums, which fits the definition of product-of-sums form where several sums are multiplied together.
Step-by-step explanation:
The expression in the product-of-sums form from the options provided is (A + B) (C + D). Product-of-sums form is a logical expression in which several sums are multiplied together. Each sum consists of literals or variables that can either be in complemented or uncomplemented form.
For example, a product-of-sums expression can look like this: (X + Y)(Y + Z'). Here, two sums (X + Y) and (Y + Z') are multiplied by each other, following the product-of-sums format.
Option a) (A + B) (C + D) correctly represents this form, as it is the multiplication of two sums. In this case, 'A + B' and 'C + D' are two sums that are multiplied together. Both expressions contain the summation of variables, consistent with the product-of-sums requirement.