Form classification check: Consider the Boolean expression (A + B) * (C + D’). Decide whether classifying it as a product-of-sums (POS) expression is correct.

Introduction / Context:
Boolean expressions are commonly written in canonical or standard forms. Two key forms are sum-of-products (SOP) and product-of-sums (POS). Being able to recognize these patterns is essential for mapping to AOI/OAI structures and for minimization with K-maps or algebraic methods.

Given Data / Assumptions:

• Expression under review: (A + B) * (C + D’).
• Operator conventions: + denotes OR, * denotes AND, ’ denotes NOT.
• Each parenthesized term is a sum (OR) of literals.

Concept / Approach:
A product-of-sums (POS) is an AND of sum terms. Each sum term is an OR of literals. In this case, (A + B) is a sum term, and (C + D’) is another sum term; their AND constitutes a POS expression. In contrast, SOP is an OR of product terms such as AB + CD’.

Step-by-Step Solution:

Verification / Alternative check:

Why Other Options Are Wrong:

Common Pitfalls:

Final Answer: