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The input impedance $\left(Z_i\right)$ and the output impedance $\left(Z_0\right)$ of an ideal transconductance (voltage controlled current source) amplifier are

1. $Z_i=0, Z_0=0$
2. $Z_i=0, Z_0=\infty$
3. $Z_i=\infty, Z_0=0$
4. $Z_i=\infty, Z_0=\infty$