Which of the following statements relating to tsunami is/are correct? As the tsunami leave the deep water of the open sea and travel towards shallow water- 1. the speed is reduced considerably. 2. they attain enormous height. 3. they appear as a gentle rise and fall of the sea. Select the correct answer using the code given below.

• A. 1 and 2 only
• B. 2 and 3 only
• C. 1 only
• D. 1, 2 and 3 only