“The exclusive original jurisdiction of the Supreme Court extends to the disputes which involve a question, whether of law or fact, on which the existence or extent of a legal right depends.” In this context, consider the following matters:
1. A dispute arising out of any pre-Constitution treaty or agreement.
2. Any dispute between two or more states.
3. A dispute between the Centre and any of the states.
4. Matters referred to the finance commission.
In how many of the above matters does the Supreme Court enjoy exclusive original jurisdiction?