A coaxial cable consists of a thin inner conductor fixed along the axis of a hollow outer conductor. The two conductors carry equal currents in opposites directions. Let \[{{B}_{1}}\]and \[{{B}_{2}}\] be the magnetic fields in the region between the conductors and outside the conductor, respectively Then,

• A. \[{{B}_{1}}\ne 0,\,{{B}_{2}}\ne 0\]
• B. \[{{B}_{1}}={{B}_{2}}=0\]
• C. \[{{B}_{1}}\ne 0,{{B}_{2}}=0\]
• D. \[{{B}_{1}}=0,{{B}_{2}}\ne 0\]