Identify the correct statements about tsunamis. Choose the correct answer from the options given below:

1.All tsunamis are seismic sea waves.

2.As the tsunami approaches shore its velocity drops and the wave height greatly increases.

3.Modern tsunami warning systems depend on sea bed seismometers, submerged devices and satellites.

4.In the open sea, lack of steepness and the tsunami wave's very long period cause a slow and imperceptible rise.

A1, 3 and 4

B1, 2 and 3

C2, 3 and 4

D1 and 3

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