A staircase light is controlled by two switches, one at the top of the stairs and the other at the bottom of the stairs, such that the light is ON when and only when one of the switches is ON and the other switch is OFF. What will be the logic equation in SOP form?

A staircase light is controlled by two switches, one at the top of the

1.	A staircase light is controlled by two switches, one at the top of the stairs and the other at the bottom of the stairs, such that the light is ON when and only when one of the switches is ON and the other switch is OFF. What will be the logic equation in SOP form?
A.	A + B
B.	\(\overline {A + B} \)
C.	A̅B + AB̅
D.	AB
Answer» D. AB