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The first and the last critical frequencies (singularities) of a driving point impedance function of a passive network having two kinds of elements, are a pole and a zero respectively. The above property will be satisfied by

1. $\text{RL}$ network only
2. $\text{RC}$ network only
3. $\text{LC}$ network only
4. $\mathrm{RC}$ as well as $\mathrm{RL}$ networks