A capacitor `C` is connected to two equal resistances as shown in the figure. Consider the following statemets

i. At the time of charging of capacitor time constant of the circuit is `2CR`
ii. At the time of discharging of the capacitor the time constant of the circuit is `CR`
iii. At the time of discharging of the capacitor the time constant of the circuit is `2CR`
iv At the time of charging of the capacitor the time constant of the circuit is `2CR`