Consider the following pairs of Mountain Passes and the places they connect:
1.Zoji La — Connects Srinagar and Leh
2.Shipki La — Connects Kullu Valley and Lahaul-Spiti
3.Lipulekh — Connects Uttarakhand and Tibet
4.Nathu La — Connects Arunachal Pradesh and Tibet
How many of the above pairs are correctly matched?