Consider the following statements regarding the National Commission for Scheduled Tribes (NCST):

1. The NCST was originally mentioned in the Constitution of India under Article 338.

2. The NCST has binding powers over the Central and State governments.

3. The primary function of the NCST is to investigate and monitor the implementation of safeguards for Scheduled Tribes provided in the Constitution.

4. The President can forward any report of NCST pertaining to a State Government to the concerned State Governor.

5. The term 'Scheduled Tribes' is defined in the Constitution of India.

How many of the above statements are correct?