In an experiment, a set of readings are obtained: $1.24 \ mm, 1.25 \ mm, 1.23 \ mm, 1.21 \ mm$. The expected least count of the instrument used in recording these readings is . . . . . . $mm$.
- A$0.01$
- B$0.001$
- C$0.1$
- D$0.05$
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