What are the benefits of getting special status for a state?

• A. Significant concession in income tax and corporate tax, excise and customs duty.
• B. The central government itself bears 90% of the state expenditure (given as grants) on all centrally sponsored schemes and external assistance.
• C. 30 percent of the plan expenditure (the Union budget) is given to the 'special category' states.
• D. All of the above