f = D0 + D1

= (~A1 . ~A0) + (~A1 . A0)

= (~A1)

= ~(D2 . D3)

= ~( (A1 . ~A0) . (A1 . A0) )

= ~( (x . ~y) . (x . y) )

= (~(x . ~y) + ~(x.y) )

= ( (~x + y) + ~x + ~y ) = (~x + ~x + y + ~y) = 1

option d)

= (~A1 . ~A0) + (~A1 . A0)

= (~A1)

= ~(D2 . D3)

= ~( (A1 . ~A0) . (A1 . A0) )

= ~( (x . ~y) . (x . y) )

= (~(x . ~y) + ~(x.y) )

= ( (~x + y) + ~x + ~y ) = (~x + ~x + y + ~y) = 1

option d)