(a) Correct
(b) Correct
(c) Correct
(d) Incorrect. Correct form is A . A’ = 0
(e) Correct
(f) Correct
(g) Incorrect. Correct form is (A + B)’ = A’B’
(h) Incorrect. Correct form is (AB), = A’ + B
(i) Correct
(j) Correct
(k) Correct
(l) Incorrect. Correct form is X + YZ = (X + Y)(X + Z)