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The length of a rod is measured by four ...

The length of a rod is measured by four different instruments and the measurements are reported as
A. 500.0 mm , B. 50.0 cm , C.0.500 m , D. `5.0xx10^(-4)` km
We can conclude that

A

A is most accurate measurement

B

C is most accurate measurement

C

A, C and B are equally accurate measurements

D

The accuracy of all the measurements is the same

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