Change $Q$ on a capacitor varies with voltage $V$ as shown in the figure, where $Q$ is taken along the $X$-axis and $V$ along the $Y$-axis. The area of triangle $OAB$ represents
  • A
    Capacitance
  • B
    Capacitive reactance
  • C
    Magnetic field between the plates
  • D
    Energy stored in the capacitor
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