There are 5 wires (circled numbers) used to implement the following logic circuit. There is a fault in wire-3. The fault in the wire-3 is always producing logic 1 (stuck at 1 indicated by s-a-1) irrespective of input z. What is the Boolean expression for output f of the faulty circuit? x y (a) f = xz+yz (b) f=x+y (c) f=1 (d) f=0 s-a-1 *