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4. IRP is the process for integrating supply and demand-side resources to provide energy services at a cost that balances the interests of all stakeholders... The goals of IRP have evolved from least cost planning and encouragement of demand-side management to broader, more complex issues including core competitive business activity, risk management and sharing, accounting for externalities, and fuel switching between gas and electricity. Future Directions: Integrated Resource Planning Based on the given background above, answer the following questions. a. Explain why the integrated resource planning (IPR) is a future direction. (3 marks) b. Which step of the IRP process requires various historic data to implement its function? And list at least 3 types of data used for the step and explain why the step is important in IRP. (3 marks) c. Among demand side management options, which one focuses on guiding customers' behavior and which one is related to making use of other forms of energy instead of just electricity? Is there any method to help selecting these options