The following statements (S1, S2, S3, S4) pertain to Dissolved oxygen in Surface water.

S1 : Warm water holds more dissolved oxygen than Cold water.

S2 : Respiration of organisms living in water as well as in sediments cause reduction in the available dissolved oxygen.

S3 : Water holds less oxygen at higher altitudes.

S4 : During day time, Photosynthesis activity in surface water leads to decrease in the Dissolved oxygen concentration.

Choose the correct statement(s)