Consider the following assertion:

Mangrove forests are specially adapted to coastal environments influenced by both saltwater and tidal action.

Which of the following statements support the assertion?

1. Mangroves contain several salt-tolerant plant species.
2. They grow in salt marshes, tidal creeks, mudflats and estuaries.
3. Their creeks, stagnant water and tidal flows provide shelter to a wide variety of birds.
4. They are primarily associated with dry Himalayan slopes above 3,000 metres.

Select the correct answer using the code given below.