[单选题](2).下述关于积分(P{X>z,Y>z}=int!!!intlimits_D{f(x,y)dxdy})中，二重积分上下限正确的是（）。
A
A.( int_{-infty }^z {int_{-infty }^z {f(x,y)dxdy} } )
B
B.( int_{-infty }^infty {int_{-infty }^infty {f(x,y)dxdy} } )
C
C.( int_{-infty }^infty {int_{-z}^z {f(x,y)dxdy} } )
D
D.( int_z^infty {int_z^infty {f(x,y)dxdy} } )
