Consider the following statements relating to the stability of floating as well as submerged bodies :

1. A submerged body is stable when the centre of gravity is below the centre of buoyancy.
2. A floating body is stable when the centre of gravity is above the centre of buoyancy.
3. A floating body is stable when the centre of gravity is below the metacentre.
4. A submerged body is in stable equilubrium when the centre of gravity conincides with the centre of buoyancy.

Of these statements