A meter bridge is set up as shown in figure, to determine an unknown resistance `X` using a standard `10 Omega` resistor. The galvanometer shows null point when tapping key is at `52 cm` mark. The end-corrections are `1 cm and 2 cm` respectively for the ends A and B. The determined value of `X` is
Options:
(a) `10.2 Omega`
(b) `10.6 Omega`
(c) `10.8 Omega`
(d) `11.1 Omega`