A vernier callipers used by student has `20` divisions in `1cm` on main scale. `10` vernier divisions coincide with `9` main scale divisions. When jaws are closed, zero of main scale is on left of zero of vernier scale and `6th` divisions of vernier scale coincides with any mains scale divisions. He placed a wooden cylinder in between the jaws and measure the length. The zero of vernier scale is on right of `3.2 cm` mark of main division and `8th` division of vernier scale with any main scale division. When he measures diameter of cylinder he finds that zero of vernier scale lies on right of `1.5 cm` mark of main scale and `6th` division of vernier scale coincides with any main scale division.
Least count and zero error of vernier callipers are
A. `0.05cm`, `+0.3cm`
B. `0.05mm`, `-0.3mm`
C. `0.005cm`, `+0.03cm`
D. `0.05cm`, `-0.3cm`
