Which one of the following statements regarding a Fiord are correct ?
1. Most of the fiords were formed due to a rise in sea level after melting of Pleistocene ice sheets.
2. It is an emergent coast which originally was a submerged glaciated valley.
3. It is a long, narrow inlet of the sea bounded by steep mountain slopes extending to considerable depths.
4. It is a glaciated valley that has been inundated by the sea and forms a deep steep-sided coastal inlet.
Select the correct answer using the Codes given below.