Explanation:

Special category status (SCS) is a classification given by the Centre to assist development of states that face geographical and socio-economic disadvantages.

• This classification was done on the recommendations of the Fifth Finance Commission in 1969.

It was based on the Gadgil formula. The parameters for SCS were:

• Hilly Terrain;
• Low Population Density And/Or Sizeable Share of Tribal Population;
• Strategic Location along Borders With Neighbouring Countries;
• Economic and Infrastructure Backwardness; and
• Nonviable Nature of State finances.

SCS was first accorded in 1969 to Jammu and Kashmir, Assam and Nagaland. Since then eight more states have been included (Arunachal Pradesh, Himachal Pradesh, Manipur, Meghalaya, Mizoram, Sikkim, Tripura and Uttarakhand).

• Special Category Status for plan assistance was granted in the past by the National Development Council to the States that are characterized by a number of features necessitating special consideration.
• Now, it is done by the central government. 
• The 14th Finance Commission has done away with the 'special category status' for states, except for the Northeastern and three hill states.

Hence both statements 1&3 are correct.