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A $6$ pole $3$ phase wound-rotor induction machine is driven by another machine at $180 \mathrm{rpm}$. The rotor of the induction machine is connected to a $50 \mathrm{~Hz}$ system. If the mechanical rotation of the rotor is in the same direction as the rotor winding fluc rotation, then the frequency of the stator voltage will be

1. $50 \mathrm{~Hz}$
2. $140 \mathrm{~Hz}$
3. $150 \mathrm{~Hz}$
4. $200 \mathrm{~Hz}$.