Consider the following pairs of national sports awards and their actual purpose:

1. Khel Ratna Award : India's highest sporting honour, given for the most outstanding performance in sports over a period of four years

2. Dronacharya Award : Given to coaches for producing medal-winning performances at the international level

3. Arjuna Award : Given exclusively to corporate entities for sponsoring national sports federations

4. Rashtriya Khel Protsahan Puraskar : Given only to individual athletes for lifetime achievement in a sport

How many of the pairs given above are correctly matched?