The charge on a parallel plate capacitor varies as $q = q_0 \cos(2\pi \nu t).$ The plates are very large and close together (area $= A,$ separation $= d$). The displacement current through the capacitor is

• A
  $q_0 \, 2\pi \nu \sin(2\pi \nu t)$
• B
  $-q_0 \, 2\pi \nu \sin(2\pi \nu t)$
• C
  $q_0 \, 2\pi \sin(\pi \nu t)$
• D
  $q_0 \, \pi \nu \sin(2\pi \nu t)$