A leak proof cylinder of length 1 m, made of a metal which has very low coefficient of expansion is floating vertically in water at 0∘C such that its height above the water surface is 20 cm. When the temperature of water is increased to 4∘C, the height of the cylinder above the water surface becomes 21 cm. The density of water at T=4∘C, relative to the density at T=0∘C is close to:
a. 1.26
b. 1.04
c. 1.01
d. 1.03