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You measure two quantities as A = 1.0 m...

You measure two quantities as `A = 1.0 m +- 0.2 m, B = 2.0 m +- 0.2 m`. We should report correct value for `sqrt(AB)` as

A

`1.4 m +- 0.4 m`

B

`1.41 m - 0.15 m`

C

`1.4 m +- 0.3 m`

D

`1.4 m +- 0.2 m`

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