In a slide caliper, \((m+1)\) number of vernier divisions is equal to \(m\) number of smallest main scale divisions. If \(d\) unit is the magnitude of the smallest main scale division, then the magnitude of the vernicr constant is
- A\(d /(m+1)\) unit
- B\(d / m\) unit
- Cmd/ \((m+1)\) unit
- D\((m+1) d / m\) unit
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