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Water is being filled at the rate of 1 c...

Water is being filled at the rate of `1 cm^3` / sec in a right circular conical vessel (vertex downwards) of height 35 cm and diameter 14 cm. When the height of the water level is 10 cm, the rate (in `cm^2` /sec) at which the wet conical surface area of the vessel increases is

A

5

B

`sqrt21/5`

C

`sqrt26/5`

D

`sqrt26/10`

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