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A vertical glass jar is filled with wate...

A vertical glass jar is filled with water at `10^(@)C`. It has one thermometer at the top and another at the bottom. The central region of the jar is grdually cooled. It is found that the bottom thermometer reads `4^(@)C` earlier than the top thermometer. And the top thermometer reads `0^(@)C`. earlier than the bottom thermometer. This happens because

A

The top thermometer is faulty

B

The bottom thermometer is faullty

C

Density of water is maximum at `4^(@)C`

D

Density of water is minimum at `0^(@)C`

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