Select the phrase/connector from the given three options which can be used to form a single sentence from the two sentences given below, implying the same as expressed in the statement sentence.
The Himalayas are often called "The Roof of the World". The Himalayas contain some of the most extensive and rough high altitude areas on Earth.
1. Which are often
2. While the Himalayas contain
3. Whereas the Himalayas contain
1
Only 1
2
Only 2
3
Only 3
4
Both 2 and 3
5
Both 1 and 2