A student performs an experiment of measuring the thickness of a slab with a vernier calliper whose 50 divisions of the vernier scale are equal to 49 divisioions of the main scale . He noted that zero of the vernier scale is between `7.00 ` cm and `7.50 ` cm mark of the main scale and 23 rd division of the vernier scale exactly coincides with the main scale . The measured value of the thickness of the given using the calliper will be

Options

A. `7.73 cm`
B. `7.23 cm`
C. `7.023 cm`
D. `7.073cm`