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The following sketch shows the pipelines carrying material from one location to another. Each location has a demand for material. The demand at Vaishali is $400,$ at Jyotishmati is $400,$ at Panchal is $700,$ and at Vidisha is $200.$ Each arrow indicates the direction of material flow through the pipeline. The flow from Vaishali to Jyotishmati is $300.$ The quantity of material flow is such that the demands at all these locations are exactly met. The capacity of each pipeline is $1000.$

The free capacity available at the Avanti-Vaishali pipeline is

1. $0$
2. $100$
3. $200$
4. $300$

1