Question

Which of the following expressions is in the product-of-sums form?

(a) (A + B)(C + D)

(b) (AB)(CD)

(c) AB(CD)

(d) AB + CD

The question was asked in a job interview.

I'd like to ask this question from K-Map Simplification in section Arithmetic Circuits of Digital Circuits

Answer 1

The correct option is (a) (A + B)(C + D)

The best I can explain: (A + B)(C + D) represents the product-of-sums form.