An aluminium sphere is dipped into water. Which of the following is true?

Options :

1. Buoyancy will be less in water at 0°C than that in water at 4°C

2. Buoyancy will be more in water at 0°C than that in water at 4°C

3. Buoyancy in water at 0°C will be same as that in water at 4°C

4. Buoyancy may be more or less in water at 4°C depending on the radius of the sphere