With reference to river Teesta, consider the following statements : 1. The source of river Teesta is the same as that of Brahmaputra but it flows through Sikkim. 2. River Rangeet originates in Sikkim and it is a tributary of river Teesta. 3. River Teesta flows into Bay of Bengal on the border of India and Bangladesh. Which of the statements given above is/are correct ?

1. (a)1 and 3 only
2. (b)2 only
3. (c)2 and 3 only
4. (d)1, 2 and 3