Which of the following is true about water resources?

Approximately, 70 per cent of the earth’s surface is covered with water. Freshwater constitutes only about 24 per cent of the total water available on earth. a very small proportion of freshwater is effectively available for human use. All of the above

a very small proportion of freshwater is effectively available for human use.

Approximately, 71 per cent of the earth’s surface is covered with it but freshwater constitutes only about 3 per cent of the total water. In fact, a very small proportion of freshwater is effectively available for human use