A.N1=3,N2=4 B.N1=5,N2=4 C.N1=4,N2=4 D.N1=5,N2=5
A.M+N B.M+N-1 C.M+N+1 D.2(M+N)
A.L≥N+M-1 B.LC.L=N D.L=M