Three infinitely long wires, each carrying a current 1 A, are placed such that one end of each wire is at the origin, and, one of these wires is along x-axis, the other along y-axis and the third along z-axis. Magnetic induction at point $\left(-2\mathrm{m},0,0\right)$ due to the system of these wires can be 
expressed as:

• A

  $\frac{{\mathrm{\mu }}_0}{4\mathrm{\pi }}\left(\widehat{\mathrm{j}}+\widehat{\mathrm{k}}\right)$

• B

  $\frac{{\mathrm{\mu }}_0}{4\mathrm{\pi }}\left(\widehat{\mathrm{j}}-\widehat{\mathrm{k}}\right)$

• C

  $\frac{{\mathrm{\mu }}_0}{8\mathrm{\pi }}\left(\text{-}\widehat{\mathrm{j}}+\widehat{\mathrm{k}}\right)$

• D

  $\frac{{\mathrm{\mu }}_0}{8\mathrm{\pi }}\left(\widehat{\mathrm{j}}+\widehat{\mathrm{k}}\right)$