"Curing concrete is the process used to stop freshly poured concrete from drying quickly. Curing is done because concrete if left to dry quickly will become weak and will tend to crack easily. To prevent quick drying after hardening sufficiently, newly laid concrete floors are cured in the following ways:
P) by building bunds on the four sides of the concrete floor and flooding the area with water.
Q) by covering the area with sackcloth and spraying with water.
R) by spraying the area with water and covering it with a plastic sheet.
Which of the above methods of curing is likely to use the LEAST amount of water"