Round off to 3 significant figures : (...

Round off to 3 significant figures :
(i) 20.96 (ii) 0.0003125 .

A

`21.0 , 312xx10^(-4)`

B

`21.0 , 3.12xx10^(-4)`

C

`2.10 , 3.12xx10^(-4)`

D

`210, 3.12xx10^(-4)`

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The correct Answer is:

B

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