When the key K is pressed at time t = 0 which of the following statements about the current I in the resistor AB of the given circuit 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

• D

  At t = 0, I= 2 mA and with time it goes to 1 mA