The respective number of significant figures for the numbers 23.023, 0.0003 and 2.1 $ \times $ 10–3 are

Question

The respective number of significant figures for the numbers 23.023, 0.0003 and 2.1 $ \times $ 10^–3 are

5, 1, 2

5, 1, 5

5, 5, 2

4, 4, 2

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