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In the circuit shown, when the key $k $ is pressed at time $t = 0$, which of the following statements about current $I$ in the resistor $AB $ is true
  • A$I = 2\,mA$ at all $t$
  • B$I$ oscillates between $1$ $mA$ and $2$ $mA$
  • C$I = 1$ $mA$ at all $t$
  • DAt $t = 0$, $I$ $=$ $2\,mA$ and with time it goes to $1$ $mA$
Diffcult
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