Direction: The following passage consists of six sentences. The first and the sixth sentences are given. The middle four sentences in each have been removed and jumbled up. These are labeled P, Q, R, and S. You are required to find out the proper sequence of the four sentences and choose the correct order from the options.

S1: The Himalayas are mountain barriers that stretch over the borders of northern India. 

S6: It is also known regionally as Kashmir and Himachal Himalaya from west to east respectively. 

P: These are one of the most rugged and loftiest mountains of the world and are one of the major landforms of earth. 

Q: The Himalayas form an arc that covers a distance of 2,400 Km. 

R: The part of the Himalayas lying between Indus and Satluj has been traditionally known as Punjab Himalaya.

S: The Himalayas primarily consists of three parallel ranges.