Two very long, straight, and insulated wires are kept at 90° angle from each other in xy-plane as shown in the figure.These wires carry currents of equal magnitude I, whose directions are shown in the figure. The net magnetic field at point P will be:

• A. Zero
• B. \( - \frac{{{{\rm{\mu }}_0}{\rm{I}}}}{{2{\rm{\pi d}}}}\left( {\hat x + \hat y} \right)\)
• C. \(\frac{{ + {{\rm{\mu }}_0}{\rm{I}}}}{{{\rm{\pi d}}}}\left( {\hat z} \right)\)
• D. \(\frac{{{{\rm{\mu }}_0}{\rm{I}}}}{{2{\rm{\pi d}}}}\left( {\hat x + \hat y} \right)\)