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Boolean Algebra and Logic Simplification - Technical MCQs

Q1:

Which of the following expressions is in the sum-of-products (SOP) form?

A (A + B)(C + D)

B (A)B(CD)

C AB(CD)

D AB + CD

ANS:D - AB + CD

SOP is sum of minterms.here no of variable=4(A,B,C,D)
so AB+CD is not a SOP form.for example ABCD+ABCD' is a SOP form.which can be written as sum(14,15).because 14=1110; and 15=1111 in binary which makes the corresponding minterm logic high.