Consider the following statements:
1. A valley glacier consists of not only ice but rocks also.
2. The largest valley glaciers in India are in the Karakoram range.
3. Mountain glaciers can dig new valleys.
Which of the statements given above is/are correct?
(a) 1 only (b) 1 and 2 (c) 2 and 3 (d) 1, 2 and 3