The length of the rod is measured with a...

The length of the rod is measured with a rod calbrated in millimeteres. Which of the following is the correct expression for length, keeping in view the experimental error ?

`(20.0+-0.5)cm`

`(20.0+-0.1)cm`

`(20.0+-0.05)cm`

`(20.0+-0.01)cm`

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