one of this is wrong, which one was wrong

Question 1 A prime implicant of F(A,B,C)=m(2,3,4,5,7) is: Selected Answer: AB Question 2 The minimum SOP for F(A,B,C,D)=m(3,6,7,12)+d(2,8,9,10,11) is: Selected Answer: AC+ AC'D' Question 3 The circuit for F=A(B+C)+D has: Selected Answer: 3 gates, 3 levels, 6 inputs Question 4 Use a K-Map table to find the minimum SOP, for F(A,B,C)=m(0,2,5,6)+d(1,4). Selected Answer: B+B