`I_(1)=int_(0)^((pi)/2)(sinx-cosx)/(1+sinxcosx)dx, I_(2)=int_(0)^(2pi)cos^(6)dx`,
`I_(3)=int_(-(pi)/2)^((pi)/2)sin^(3)xdx, I_(4)=int_(0)^(1) In (1/x-1)dx`. Then
A. `I_(2)=I_(3)=I_(4)=0,I_(1)!=0`
B. `I_(1)=I_(2)=I_(3)=0,I_(4)!=0`
C. `I_(1)=I_(3)=I_(4)=0,I_(2)!=0`
D. `I_(1)=I_(2)=I_(3)=0,I_(4)!=0`