The circuit shown has been operating for a long time. The instant after the switch in the circuit labeled S is opened, what is the voltage across the inductor \[{{V}_{L}}\] and which labeled point (A or B) of the inductor is at a higher potential? Take \[{{R}_{1}}=4.0\,\Omega \], \[{{R}_{2}}=8.0\,\Omega \] and \[L=2.5\,H\].

• A. \[{{V}_{L}}=12V\], point A is at the higher potential
• B. \[{{V}_{L}}=12V\], point B is at the higher potential
• C. \[{{V}_{L}}=6V\], point A is at the higher potential
• D. \[{{V}_{L}}=6V\], point B is at the higher potential