The current gain $( I_{\text{out}}/I_{\text{in}})$ in the circuit with an ideal current amplifier given below is

1. $\dfrac{C_{f}}{C_{c}}$
1. $\dfrac{-C_{f}}{C_{c}}$
1. $\dfrac{C_{c}}{C_{f}}$
1. $\dfrac{-C_{c}}{C_{f}}$