A.(x%4==0)or(x%100!=0) B.(x%4==0)and(x%100!=0) C.(x/4==0)or(x/100!=0) D.(x/4==0)and(x/100!=0)
A.25 B.13 C.9 D.7.4
A.n/2=0 B.n%2==0 C.n%2=0 D.n/2==0