# Boolean Algebra – 3

3. Two binary signals a,b are to be compared. The output expression when the two signals are equal is given by :

(a) $\dpi{100} a\bar{b}+\bar{a}b$
(b) $\dpi{100} ab+\bar{a}\bar{b}$
(c) $\dpi{80} \dpi{100} ab$
(d) $\dpi{100} \bar{a}\bar{b}$