Field of a coaxial cable carrying equal and opposite currents

1. A.
   $\frac{x^{2}}{a^{2}}$
2. B.
   $\frac{a^{2}}{x^{2}}$
3. C.
   $\frac{x^{2}}{b^{2} - a^{2}}$
4. D.
   $\frac{b^{2} - a^{2}}{x^{2}}$

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1. A.
   inside the outer conductor
2. B.
   in between the two conductors
3. C.
   outside the cable
4. D.
   inside the inner conductor

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