In the circuit shown below the switch is closed at `t=0`. For `0 lt t lt R (C_(1)+C_(2))`, the current `I_(1)` in the capacitor `C_(1)` in terms of total current I is
A. `((C_(1))/(C_(2))) I`
B. `((C_(2))/(C_(1))) I`
C. `((C_(1))/(C_(1)+C_(2))) I `
D. `((C_(1))/((C_(1)+C_(2))))I`
