In the optimum generator scheduling of different power plants,

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In the optimum generator scheduling of different power plants, the minimum fuel cost is obtained when

1. only the incremental fuel cost oif each plant is the same
2. the penalty factor of each plant is the same
3. the ratio of the incremental fuel cost to the penalty factoir of each plant is the same
4. the incremental fuel cost of each pl ant multiplied by its penalty factor is the same

Correct Option: D

where, P_L = penalty factor