Consider the following statements:

1. The Western Ghats force one branch of the Arabian Sea monsoon to rise and produce heavy windward rainfall.
2. After crossing the Ghats, descending winds become warmer and drier, producing a rain-shadow region.
3. Another branch moves through the Narmada and Tapi valleys and later merges with the Bay of Bengal branch.
4. The branch crossing Saurashtra and western Rajasthan produces heavy rainfall because the Aravalis obstruct it at right angles.

Which of the statements given above are correct?