Match List-I with
List II
A. integral(0 to inf) 1/(1+x^2) dx
B. integral(1 to inf) 1/sqrt(x) dx
C. integral(-inf to -1) 1/x^4 dx
D. integral(-inf to +inf) 1/(1+x^2) dx.
List II
I. does not exist
II. 1/3
III. pi/2
IV. pi.
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