The figure shows a diagonal symmetric arrangement of capacitors and a battery. If the potential of $C$ is zero, then
  • A$V_A = + 20\,V$
  • B$4(V_A - V_B) + 2(V_D - V_B) = 2V_B$
  • C$2(V_A - V_D) + 2(V_B - V_D) = 4V_D$
  • D
    all of the above.
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